Applications manual
For tankless and point of use water heaters
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Applications manual
| 3
1 Introduction
The Bosch Applications Manual is intended to present some of the
most common applications of the Bosch line of tankless and point of
use water heaters. Application drawings are shown with both piping
and corresponding electrical schematics where applicable. Auxiliary
equipment depicted does not necessarily represent any one manu-
facturer or specific model number. There are a wide variety of
techniques, practices and piping strategies possible when installing
water heating appliances. It is the responsibility of the installing
contractor to determine the most suitable arrangement for the
application.
Although this manual covers many common applications for our
products, system possibilities are virtually endless. Should you
encounter an application that is not covered in this manual or have
any questions regarding any of its content, we encourage you to
contact your local sales representative or us directly at Bosch Water
Heating.
This is not a substitute for any of the product’s installation manuals.
All specifications subject to change.
Installation must conform with local codes or, in the absence of
local codes, the National Fuel Gas Code ANSI Z 223.1/NFPA 54.
In Canada: Installation must conform with CGA B149.(1,2) INSTAL-
LATION CODES and/or local installation codes.
2 Bosch Water Heating Models
This section describes the water heaters available from Bosch Water
Heating. The information given in each section provides a general
overview to the specifications of that particular model. More detai-
led information is contained in the installation manuals. Download
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Applications manual
2.1 Sizing tankless water heaters
Definitions
ꢀ Major applications (2 GPM or more): Washing machine, bath tub,
shower nozzle
ꢀ Minor applications(1.5 GPM or less): Low flow shower head,
bathroom sink, kitchen sink
Rule of thumb sizing
The tables below provide a general rule of thumb when sizing for
most residential applications. For commercial applications or for a
more detailed sizing method, use the instructions below in conjunc-
tion with the charts on the next page.
Sizing by Chart
ꢀ Measure the flow rates at each fixture that will be used simultane-
ously and add them together. If only one application will be used
at a time measure each fixture and use the maximum flow rate
observed.
Rule of Thumb Sizing
Model Number
Number of Major
Applications
Number of Minor
Applications
GWH 715 ES
GWH C 800 ES
GWH 425 HN/PN/EF
GWH 425 HN/PN/EF
GWH 260 PN
2
2
1
0
1
1
1
0
1
1
2
0
0
1
RP17PT
RP27PT
ꢀ Using a known volume container, record several fill times. Per-
form the calculation below to determine the flow rate (a one
gallon fill time of 30 seconds is 2.0 gallons per minute (GPM):
Volume (gallons)
Fill time (sec)
sec
min
Flow rate (GPM) =
x
60
ꢀ Using a thermometer, measure the incoming water temperature.
Subtract this temperature from the desired hot water temperature
to get the degree rise. So, if the desired hot water temperature is
120F and incoming temperature is 55F, the desired degree rise is
65F.
ꢀ This example requires a flow rate of 2.0 GPM at a 65˚F rise. The
data point is shown on each graph. Since the demand is above
the GWH 260 PN capacity, this application would require a GWH
425 HN/PN/EF gas tankless water heater. The electrical model
used for this application would be the RP27PT electric tankless
water heater.
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| 5
GPM
8
7
6
5
4
3
2
1
0
00 ES
GWH 715 ES
PN/HN
GWH 260 PN/HN
10
20
30
40
50
60
70
80
90
Degree rise (°F)
Gas Appliance Sizing Chart
GPM
4.0
3.5
3.0
2.5
2.0
RP27PT
1.5
1.0
RP1P
RP7P
RP3P
0.5
0.0
RP9P
80
10
20
30
40
50
60
70
90
Degree rise
Electric Appliance Sizing Chart
Note: Maximum flow rates dependant on site conditions
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Applications manual
2.2 Bosch GWH 715 ES
Features:
GWH 715 ES Installation Clearances
ꢀElectronic ignition and built in power vent
ꢀ82% thermal efficiency
ꢀVents vertically or horizontally with 3" or 4" stainless steel (AL29-
4C)
Top (A)
12"
Front (B)
Back
1"
0"
ꢀDirect vent room-sealed combustion
ꢀComputerized temperature control — ensures temperature stability
ꢀModel GWH 715 ES N for natural gas (NG) supply
ꢀModel GWH 715 ES L for liquid propane (LP) supply
ꢀ15-year warranty
Sides
1"
Floor (C)
12"
ꢀQualifies for $300 tax credit
GWH 715 ES Technical Specifications
Gas input
Natural Gas: 19,900 - 199,000 BTU
LP Gas: 19,900 - 199,000 BTU
0.65 gallons per minute (gpm)
3ft minimum
distance
Minimum flow to activate
Flow rates
45˚F rise @ 7.2 gpm
55˚F rise @ 5.9 gpm
65˚F rise @ 5.0 gpm
77˚F rise @ 4.2 gpm
90˚F rise @ 3.6 gpm
Thermal Efficiency
Dimensions
NG: 82% LP: 82%
30½" h x 17⅞" w x 11¼" d
Weight
67 lbs.
yes
Modulating gas valve
Ignition
3ft minimum
distance
Electronic
Accessories
Outdoor kit (PTOK)
Wireless Remote (TSTAT2)
Tankless Link Cascading Kit (TLINK)
Freeze Prevention Kit (8700400022)
Water Filter Kit (8703305356)
Fig. 1 Venting configurations
Installation guidelines:
Venting:
ꢀ Must be 3" or 4" AL29-4C sealed stainless steel vent pipe.
ꢀ Slope horizontal runs up to termination ¼" per foot. The last
horizontal section of exhaust vent pipe between last elbow and
termination must slope down to the termination ¼" per foot.
ꢀ Do not combination vent with any other appliance.
ꢀ Install condensate drain where applicable.
GWH 715 ES Installation Specifications
Gas connection
¾" Male NPT
¾" Male NPT
Water connections
NG gas pressure
Minimum: 4" W.C.
Maximum: 14" W.C.
LP gas pressure
Minimum: 9" W.C.
Maximum: 14" W.C.
ꢀ See manual for vent terminator clearances.
Water pressure
(Static)
Minimum: 30 PSI
Minimum well pressure: 40 PSI
Maximum: 150 PSI
Gas piping:
ꢀ Heater will not function properly without adequate supply gas
pressure.
ꢀ Any appliance connector should be ¾" minimum diameter
Electrical supply
Venting
120VAC - plugs in
3" or 4" stainless steel (AL29-4C)
direct vent
Plumbing:
room-sealed combustion
ꢀ Install the included pressure relief valve and pipe to suitable
drain.
ꢀ Minimum piping diameter is ¾".
ꢀ Do not solder directly to the bottom of the unit.
ꢀ Use unions to facilitate easy future maintenance.
ꢀ Use full port ball valves for isolation valves.
ꢀ Partially fill condensate drain tube loop (where applicable) with
water prior to start up.
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2.3 Bosch GWH C 800 ES
Features:
ꢀElectronic ignition and built in power vent
ꢀCondensing technology with 92% thermal efficiency
ꢀVents vertically or horizontally with 3" or 4" PVC, CPVC or ABS
(Schedule 40) vent pipe.
ꢀDirect vent room-sealed combustion with concentric venting
option
ꢀComputerized temperature control — ensures temperature stability
ꢀModel GWH C 800 ES N for natural gas (NG) supply
ꢀModel GWH C 800 ES L for liquid propane (LP) supply
ꢀ15-year warranty
GWH C 800 ES Installation Clearances
Top (A)
12"
Front (B)
Back
1"
0"
Sides
1"
Floor (C)
12"
ꢀQualifies for $300 tax credit
GWH C 800 ES Technical Specifications
Gas input
Natural Gas: 19,900 - 199,000 BTU
LP Gas: 19,900 - 199,000 BTU
0.65 gallons per minute (gpm)
MAINTAIN 12 IN.
(18 IN. FOR CANADA)
MINIMUM CLEARANCE
Minimum flow to activate
VENT
ABOVE
HIGHEST ANTICIPATED
Flow rates
45˚F rise @ 8.0 gpm
55˚F rise @ 6.4 gpm
65˚F rise @ 5.5 gpm
77˚F rise @ 4.6 gpm
90˚F rise @ 3.9 gpm
SNOW LEVEL.
COMBUSTION
AIR
MAXIMUM OF 24 IN.
ABOVE ROOF.
ROOF BOOT/
FLASHING (FIELD
SUPPLIED
MINIMUM
1”
Thermal Efficiency
Dimensions
NG: 92% LP: 92%
INTAKE
EXHAUST
VENT
INTAKE
30½" h x 17⅞" w x 11¼" d
EXHAUST
COMBUSTION
Weight
74 lbs.
yes
AIR
DRAIN TEE
Modulating gas valve
Ignition
DRAIN TEE
Electronic
Accessories
Outdoor kit (PTOK)
Wireless Remote (TSTAT2)
Tankless Link Cascading Kit (TLINK)
Freeze Prevention Kit (8700400022)
Water Filter Kit (8703305356)
Concentic Termination Kit
(BWH60L46)
Fig. 1 Venting configurations
Installation guidelines:
Venting:
ꢀ Must be 3" or 4" PVC, CPVC or ABS (Schedule 40) vent pipe.
ꢀ Attach drain for internal condensate siphon and dispose of
according to local codes.
GWH C 800 ES Installation Specifications
Gas connection
¾" Male NPT
¾" Male NPT
Water connections
NG gas pressure
Minimum: 4" W.C.
Maximum: 14" W.C.
ꢀ Do not combination vent with any other appliance.
ꢀ Install an external condensate drain where applicable.
ꢀ See manual for vent terminator clearances.
LP gas pressure
Minimum: 9" W.C.
Maximum: 14" W.C.
Water pressure
(Static)
Minimum: 30 PSI
Minimum well pressure: 40 PSI
Maximum: 150 PSI
Gas piping:
ꢀ Heater will not function properly without adequate supply gas
pressure.
ꢀ Any appliance connector should be ¾" minimum diameter
Electrical supply
Venting
120VAC - plugs in
3" or 4" PVC, CPVC, or ABS
(Schedule 40) direct vent sealed
combustion
Plumbing:
ꢀ Install the included pressure relief valve and pipe to suitable
drain.
ꢀ Minimum piping diameter is ¾".
ꢀ Do not solder directly to the bottom of the unit.
ꢀ Use unions to facilitate easy future maintenance.
ꢀ Use full port ball valves for isolation valves.
ꢀ Partially fill condensate drain tube loop (where applicable)
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Applications manual
2.4 Outdoor Installation for GWH 715 ES,
and GWH C 800 ES
Installation on wood siding
Outdoor Kit (PTOK) installation:
ꢀThe installation of this outdoor kit (PTOK) is required when
installing either of the above appliances outdoors
ꢀOutdoor cap easily retrofits to these indoor models
ꢀOutdoor kit comes with Freeze Prevention which must be installed
ꢀExterior water piping should be protected if freezing conditions
could exist
Minimum clearances:
Installation on vinyl siding:
Min.
distances
Ref.
Description
A
B
Directly below or adjacent to
an opening; operable
windows, doors and any fresh
air openings
≥ 4 ft
C
D
From any adjacent wall
≥ 4 ft
≥ 3 ft
Below a gutter, sanitary
pipework, eaves or overhang
E
F
Above ground
≥ 1 ft
≥ 5 ft
From a gas meter or gas
regulator
G
Outdoor Installation Clearances
Source: NFPA 54 National Fuel Gas Code
ANSI Z223.1
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2.6 Bosch GWH 345 ESR
Features:
ꢀSpecifically designed for recirculating applications
ꢀElectronic ignition and built in power vent
ꢀGWH 345 ESR thermal efficiency of 82%
ꢀVents vertically or horizontally with 3" stainless steel (AL29-4C)
ꢀDirect vent room-sealed combustion
ꢀComputerized temperature control — ensures temperature
stability
ꢀModel GWH 345 ESR N for natural gas (NG) supply
ꢀModel GWH 345 ESR L for liquid propane (LP) supply
ꢀ10-year warranty
GWH 345 ESR Technical Specifications
Gas input
GWH 345 ESR: 32,000 - 95,000 Btu/h
GWH 345 ESR: 3.5gpm @ 45°F rise
Fig. 1 Venting configurations
Maximum flow rates
Installation guidelines:
Thermal Efficiency
Dimensions
82%
27.5" h x 15.75" w x 11.75" d
Venting:
ꢀ Must be 3" or 4" AL29-4C sealed stainless steel vent pipe.
Weight
47 lbs.
yes
ꢀ Slope horizontal runs up to termination ¼" per foot. The horizon-
tal section between last elbow and termination must slope down
to the termination ¼" per foot.
Modulating gas valve
Ignition
Electronic
ꢀ Do not combination vent with any other appliance.
ꢀ Always install an external condensate drain except when termi-
nating horizontally with less than 3 feet of pipe.
ꢀ See manual for vent terminator clearances.
GWH 345 ESR Installation Specifications
Gas connection
¾" Male NPT
¾" Male NPT
Water connections
NG gas pressure
Gas piping:
Minimum: 5.5" W.C.
Maximum: 14" W.C.
ꢀ Heater will not function properly without adequate supply gas
pressure.
ꢀ Any appliance connector should be ¾" minimum diameter
LP gas pressure
Minimum: 11" W.C.
Maximum: 14" W.C.
Electrical supply
Venting
120VAC - plugs in
Plumbing:
3" stainless steel (AL29-4C)
direct vent
room-sealed combustion
ꢀ Install the included pressure relief valve and pipe to suitable
drain.
ꢀ Minimum piping diameter is ¾".
ꢀ Do not solder directly to the bottom of the unit.
ꢀ Use unions to facilitate easy future maintenance.
ꢀ Use full port ball valves for isolation valves.
ꢀ Partially fill condensate drain tube loop with water prior to start
up.
GWH 450 ESR Installation Clearances
Top (A)
12"
Front (B)
Back
1"
0"
Sides
1"
Floor (C)
12"
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Applications manual
2.6 Bosch GWH 450 ESR
Features:
ꢀSpecifically designed for recirculating applications
ꢀElectronic ignition and built in power vent
ꢀGWH 450 ESR thermal efficiency of 81%
ꢀVents vertically or horizontally with 3" stainless steel (AL29-4C)
ꢀDirect vent room-sealed combustion
ꢀComputerized temperature control — ensures temperature
stability
ꢀModel GWH 450 ESR N for natural gas (NG) supply
ꢀModel GWH 450 ESR L for liquid propane (LP) supply
ꢀ10-year warranty
GWH 450 ESR Technical Specifications
Gas input
GWH 450 ESR: 45,000 - 120,000 Btu/h
GWH 450 ESR: 4.5gpm @ 45°F rise
Fig. 1 Venting configurations
Installation guidelines:
Venting:
Maximum flow rates
Thermal Efficiency
Dimensions
81%
27.5" h x 15.75" w x 11.75" d
ꢀ Must be 3" or 4" AL29-4C sealed stainless steel vent pipe.
ꢀ Slope horizontal runs up to termination ¼" per foot. The horizon-
tal section between last elbow and termination must slope down
to the termination ¼" per foot.
Weight
47 lbs.
yes
Modulating gas valve
Ignition
Electronic
ꢀ Do not combination vent with any other appliance.
ꢀ Always install an external condensate drain except when termi-
nating horizontally with less than 3 feet of pipe.
GWH 450 ESR Installation Specifications
Gas connection
¾" Male NPT
¾" Male NPT
ꢀ See manual for vent terminator clearances.
Water connections
NG gas pressure
Gas piping:
Minimum: 5.5" W.C.
Maximum: 14" W.C.
ꢀ Heater will not function properly without adequate supply gas
pressure.
ꢀ Any appliance connector should be ¾" minimum diameter
LP gas pressure
Minimum: 11" W.C.
Maximum: 14" W.C.
Electrical supply
Venting
120VAC - plugs in
Plumbing:
3" stainless steel (AL29-4C)
direct vent
room-sealed combustion
ꢀ Install the included pressure relief valve and pipe to suitable
drain.
ꢀ Minimum piping diameter is ¾".
ꢀ Do not solder directly to the bottom of the unit.
ꢀ Use unions to facilitate easy future maintenance.
ꢀ Use full port ball valves for isolation valves.
ꢀ Partially fill condensate drain tube loop with water prior to start
up.
GWH 450 ESR Installation Clearances
Top (A)
12"
Front (B)
Back
1"
0"
Sides
1"
Floor (C)
12"
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2.7 Bosch GWH 425 EF
Features:
ꢀElectronic ignition and built in power vent
ꢀThermal efficiency of 82%
ꢀVents with 4" stainless steel or galvanized vent pipe
ꢀSpecifically designed for horizontal vent terminations
ꢀModulating gas valve — ensures temperature
stability
ꢀModel GWH 425 EF N for natural gas (NG) supply
ꢀModel GWH 425 EF L for liquid propane (LP) supply
ꢀ15-year warranty
ꢀQualifies for $300 tax credit (LP only)
GWH 425 EF Technical Specifications
Gas input
Natural Gas: 28,000 - 130,000 Btu/h
LP Gas: 28,000- 125,000 Btu/h
Minimum flow to
0.5 gallons per minute (GPM)
activate
Maximum flow rates
4.6 gpm @ 45°F rise
Fig. 1 Venting configurations
Installation guidelines:
Venting:
Thermal Efficiency
Dimensions
NG: 80%
LP: 82%
29.75" h x 18.25" w x 8.75" d
Weight
44 lbs.
yes
Modulating gas valve
Ignition
ꢀ
4" AL29-4C sealed stainless steel or 26 gauge galvanized vent
pipe.
Electronic
ꢀ Slope horizontal runs up to termination ¼" per foot.
ꢀ Do not combination vent with any other appliance.
ꢀ See manual for vent terminator clearances.
GWH 425 EF Installation Specifications
Gas connection
½" Male NPT
½" Male NPT
Gas piping:
Water connections
NG gas pressure
ꢀ Heater will not function properly without adequate supply gas
pressure.
ꢀ Any appliance connector should be ¾" minimum diameter
Minimum: 7" W.C.
Maximum: 14" W.C.
LP gas pressure
Minimum: 11" W.C.
Maximum: 14" W.C.
Plumbing:
ꢀ Install the included pressure relief valve and pipe to suitable
drain.
ꢀ Minimum piping diameter is ½".
ꢀ Do not solder directly to connections on the bottom of the unit.
ꢀ Use full port ball valves for isolation valves.
Electrical supply
Venting
120VAC - plugs in
4" stainless steel (AL29-4C)
or 26 gauge galvanized
GWH 425 EF Installation Clearances
Top (A)
12"
Front (B)
Back
4"
0"
Sides
4"
Floor (C)
12"
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Applications manual
2.8 Bosch GWH 425 HN
GWH 425 HN Installation Clearances
Features:
ꢀHydro-generated ignition
Top (A)
12"
Front (B)
Back
4"
0"
ꢀ80% thermal efficiency
ꢀEndless hot water for one major application at a time
ꢀVenting: 5" double wall B-vent — natural draft
ꢀModulating gas valve — constant temperature at varying flow rates
ꢀModel GWH 425 HN N for natural gas (NG) supply
ꢀModel GWH 425 HN L for liquid propane (LP) supply
ꢀ15-year warranty
Sides
4"
Floor (C)
12"
ꢀQualifies for $300 tax credit
GWH 425 HN Technical Specifications
Gas input
Natural Gas: 30,735 - 117,000 BTU
LP Gas: 30,735 - 117,000 BTU
0.6 gallons per minute (gpm)
LIS TED VE NT C AP
Minimum flow to activate
Flow rates
45˚F rise @ 4.2 gpm
55˚F rise @ 3.4 gpm
65˚F rise @ 2.9 gpm
77˚F rise @ 2.4 gpm
90˚F rise @ 2.1 gpm
MINIMUM 6
FE ET (1.8M)
Thermal Efficiency
Dimensions
NG: 80% LP: 80%
25.75" h x 16.75" w x 8.5" d
33 lbs.
Weight
LIS TED G AS VE NT
Modulating gas valve
Ignition
yes
Hydro-generated
Accessories
Horizontal vent kit (AQ4) - power
vent kit for horizontal venting
E S TAB LIS H A ONE
F OOT R IS E B E F OR E
ANY E LB OW S
GWH 425 HN Installation Specifications
Gas connection
¾" Male NPT
¾" Male NPT
Fig. 2 Venting configuration
Installation guidelines:
Venting:
Water connections
NG gas pressure
Minimum: 7" W.C.
Maximum: 14" W.C.
LP gas pressure
Minimum: 11" W.C.
Maximum: 14" W.C.
ꢀ 5" minimum diameter — do not reduce vent size
ꢀ Refer to installation manual for vent material options
ꢀ Do not combination vent with any power vented appliances
ꢀ Establish a one-foot rise before any elbows
ꢀ Minimum vent height - 6 feet
Water pressure
(Static)
Minimum: 30 PSI
Minimum well pressure: 40 PSI
Maximum: 150 PSI
Electrical supply
Vertical venting
120VAC - plugs in
ꢀ
Horizontal sections must slope upwards at least ¼" for every foot
of the horizontal length and be properly supported
5" minimum diameter - natural
draft
Gas piping:
Horizontal venting
AQ4 horizontal vent kit required
for horizontal terminations
ꢀ Heater will not function properly without adequate supply gas
pressure
ꢀ Any appliance connector should be ¾" minimum diameter
Plumbing:
ꢀ Install the included pressure relief valve and pipe to suitable drain
ꢀ Minimum piping diameter is ¾"
ꢀ Do not solder directly to connections on the bottom of the unit
ꢀ Use full port ball valves for isolation valves
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| 13
2.9 Bosch GWH 425 PN
GWH 425 PN Installation Clearances
Features:
ꢀStanding pilot ignition
Top (A)
12"
Front (B)
Back
4"
0"
ꢀ78% thermal efficiency
ꢀEndless hot water for one major application at a time
ꢀModulating gas valve — constant temperature at varying flow rates
ꢀModel GWH 425 PN N for natural gas (NG) supply
ꢀModel GWH 425 PN L for liquid propane (LP) supply
ꢀ15-year warranty
Sides
4"
Floor (C)
12"
GWH 425 PN Technical Specifications
Power input
Natural Gas: 31,000 - 117,000 BTU
LP Gas: 31,000 - 117,000 BTU
0.6 gallons per minute (gpm)
LIS TED VE NT C AP
Minimum flow to activate
Flow rates
45˚F rise @ 4.2 gpm
55˚F rise @ 3.4 gpm
65˚F rise @ 2.9 gpm
77˚F rise @ 2.4 gpm
90˚F rise @ 2.1 gpm
MINIMUM 6
FE ET (1.8M)
Thermal Efficiency
Dimensions
NG: 78% LP: 78%
25.75" h x 16.75" w x 8.5" d
33 lbs.
Weight
LIS TED G AS VE NT
Modulating gas valve
Ignition
yes
Standing pilot
Accessories
Horizontal vent kit (AQ4) - power
vent kit for horizontal venting
E S TAB LIS H A ONE
F OOT R IS E B E F OR E
ANY E LB OW S
GWH 425 PN Installation Specifications
Gas connection
¾" Male NPT
¾" Male NPT
Water connections
NG gas pressure
Fig. 4 Venting configuration
Installation guidelines:
Venting:
ꢀ 5" minimum diameter — do not reduce vent size.
ꢀ Refer to installation manual for vent material options
ꢀ Do not combination vent with any power vented appliances.
ꢀ Establish a one-foot rise before any elbows
ꢀ Minimum vent height - 6 feet.
Minimum: 7" W.C.
Maximum: 14" W.C.
LP gas pressure
Water pressure
Minimum: 11" W.C.
Maximum: 14" W.C.
Minimum: 30 PSI
Maximum: 150 PSI
Electrical supply
Vertical venting
120VAC - plugs in
5" minimum diameter - natural
draft
ꢀ Horizontal sections must slope upwards at least ¼" for every foot
of the horizontal length and be properly supported.
Horizontal venting
AQ4 horizontal vent kit required
for horizontal terminations
Gas piping:
ꢀ Heater will not function properly without adequate supply gas
pressure.
ꢀ Any appliance connector should be ¾" minimum diameter
Plumbing:
ꢀ Install the included pressure relief valve and pipe to suitable
drain.
ꢀ Minimum piping diameter is ¾".
ꢀ Do not solder directly to the bottom of the unit.
ꢀ Use full port ball valves for isolation valves.
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Applications manual
2.10 Bosch GWH 260 PN
GWH 260 PN Installation Clearances
Features:
ꢀStanding pilot ignition
Top (A)
12"
Front (B)
Back
4"
0"
ꢀ78% thermal efficiency
ꢀMounts on wall for easy installation
ꢀVenting: 4" double wall B-vent — natural draft
ꢀModulating gas valve — constant temperature at varying flow rates
ꢀModel GWH 260 PN N for natural gas (NG) supply
ꢀModel GWH 260 PN L for liquid propane (LP) supply
ꢀ15-year warranty
Sides
4"
Floor (C)
12"
GWH 260 PN Technical Specifications
LIS TED VE NT C AP
Gas input
Natural Gas: 30,735 - 74,900 BTU
LP Gas: 30,735 - 74,900 BTU
0.6 gallons per minute (gpm)
Minimum flow to activate
Flow rates
45˚F rise @ 2.6 gpm
55˚F rise @ 2.1 gpm
65˚F rise @ 1.7 gpm
77˚F rise @ 1.5 gpm
90˚F rise @ 1.3 gpm
MINIMUM 6
FE ET (1.8M)
Thermal Efficiency
Dimensions
NG: 78% LP: 78%
28.8" h x 12.2" w x 8.5" d
25 lbs.
LIS TED G AS VE NT
Weight
Modulating gas valve
Ignition
yes
E S TAB LIS H A ONE
F OOT R IS E B E F OR E
ANY E LB OW S
Standing pilot
GWH 260 PN Installation Specifications
Gas connection
¾" Male NPT
¾" Male NPT
Water connections
NG gas pressure
Fig. 4 Venting configuration
Installation guidelines:
Venting:
Minimum: 7" W.C.
Maximum: 14" W.C.
LP gas pressure
Minimum: 11" W.C.
Maximum: 14" W.C.
ꢀ 4" minimum diameter — do not reduce vent size.
ꢀ Refer to installation manual for vent material options
ꢀ Do not combination vent with any power vented appliances.
ꢀ Establish a one-foot rise before any elbows
ꢀ Minimum vent height - 6 feet.
Water pressure
(Static)
Minimum: 30 PSI
Minimum well pressure: 40PSI
Maximum: 150 PSI
Electrical supply
Venting
120VAC - plugs in
4" double wall B-vent - natural
draft
ꢀ
Horizontal sections must slope upwards at least ¼" for every foot
of the horizontal length and be properly supported.
Gas piping:
ꢀ Heater will not function properly without adequate supply gas
pressure.
ꢀ Any appliance connector should be ¾" minimum diameter
Plumbing:
ꢀ Install the included pressure relief valve and pipe to suitable
drain.
ꢀ Minimum piping diameter is ¾".
ꢀ Do not solder directly to the bottom of the unit.
ꢀ Use full port ball valves for isolation valves.
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2.11 Powerstream Pro RP17PT, RP27PT
Features:
Installation guidelines:
ꢀOver 90% efficiency rating
ꢀ10-year warranty on heat exchanger
ꢀDurable polymer construction
ꢀExternal temperature control knob
ꢀThermal cut-out for safety
Electrical:
ꢀ Minimum electrical service for RP17PT is 150 amps.
ꢀ Minimum electrical service for RP27PT is 200 amps.
ꢀ Minimum wire size for both models is 8 AWG.
ꢀFlow sensor to provide a constant output temperature
ꢀProvides an ENDLESS supply of hot water
ꢀWeighs less than 25 pounds and fits virtually anywhere
ꢀNo temperature/pressure relief valve necessary (unless required
by local codes)
Plumbing:
ꢀ Do not solder directly to connections on the bottom of the unit.
ꢀ Use unions to facilitate easy future maintenance.
ꢀ Use full port ball valves for isolation valves.
RP17PT terminal block
Technical Specifications
Model
Efficiency
RP17PT
RP27PT
90%
94%
15 ½" x 15 ¼" x 4 ½"
15 ½" x 15 ¼" x 4 ½"
Dimensions
Weight
20 lbs.
¾" Male NPT
0.6 gpm
22 lbs.
¾" Male NPT
0.8 gpm
Water fittings
Activation rate
Electrical requirements
Volts
240
240
Kilowatts
17.25kW
26.85kW
U.S.A
Amps
80 (2x40 amps)
80 (1x80 amps)
120 (3x40 amps)
120 (1x120amps)
Canada
2 independent
40 amp double-pole
circuit breakers
U.S.A
Wire
size
8 AWG
(4 conductors & ground)
8 AWG
(4 conductors & ground)
Fig. 5 RP17PT Electrical Connections
Canada
Check Canadian
Electrical Code
(C22.1-02)
Check Canadian
Electrical Code
(C22.1-02)
RP27PT terminal block
Phase
Single
Single
Maximum flow rate at given temperature rise
45°F Rise
50°F Rise
60°F Rise
70°F Rise
80°F Rise
2.6 gpm
2.3 gpm
2.0 gpm
1.7 gpm
1.5 gpm
4.0 gpm
3.7 gpm
3.0 gpm
2.6 gpm
2.2 gpm
3 independent
40 amp double-pole
circuit breakers
Fig. 6 RP27PT Electrical Connections
Bosch Water Heating
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16
Applications manual
2.12 Powerstream ProRP1P, RP2P, RP3P, RP7P,
RP9P,RP12PT
Installation guidelines:
Features:
ꢀ5-year warranty on heat exchanger
ꢀSaves space
Electrical:
ꢀ Refer to the chart below as specification varies by model
ꢀInstalls vertically or horizontally (Model RP12PT only installs
horizontally)
Plumbing:
ꢀAll models must be hardwired
ꢀSolid copper heat exchanger, copper sheathed elements and
tough plastic housing
ꢀ Do not solder directly to connections on the bottom of the unit.
ꢀ Use unions to facilitate easy future maintenance.
ꢀ Use full port ball valves for isolation valves.
ꢀHigh/low kW settings possible within most models
ꢀModel RP12PT has thermostatic adjustable control
Technical Specifications
Model Part #
RP1P
Wire Size
8AWG
Voltage
240
Amps
High kW
Low kW
Degree rise at flow rates (GPM)*
Activation
rate (GPM)
0.5
—
0.75
84°
42°
55°
28°
28°
63°
32°
84°
42°
90°
1.0
64°
32°
42°
21°
20°
48°
24°
64°
32°
72°
1.5
42°
21°
27°
14°
—
2.0
32°
16°
—
40
20
22
11
29
30
15
35
18
50
9.50
—
—
4.75
—
0.75
—
RP2P
10AWG
277
6.00
—
81°
41°
41°
—
0.50
3.00
—
—
RP3P
RP7P
10AWG
10AWG
120
240
3.40
7.20
—
—
0.50
0.75
—
32°
16°
42°
21°
52°
24°
12°
32°
16°
42°
3.60
—
—
RP9P
8AWG
6AWG
277
240
9.50
—
—
0.75
0.75
4.75
—
—
RP12PT
12.00
—
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| 17
2.13 Ariston Pro GL2.5Ti, GL4Ti, GL8Ti
Installation guidelines:
Features:
Electrical:
ꢀPoint of use mini tank
ꢀ3 models
ꢀ Follow local codes for electrical outlets for water heaters
ꢀ All models plugin to standard wall outlet.
ꢀAdjustable thermostat with thermal cut-out
ꢀDielectric isolation on inlet/outlet connections
ꢀUnits can be wall hung (bracket included) or floor mounted
ꢀDurable poly-composite housing will not dent and resists corrosion
ꢀTemperature/pressure relief valve included (plumb correctly for
discharge)
Plumbing:
ꢀ Use full port valves for isolation valves.
ꢀ Do not solder directly to the plumbing connections.
ꢀSimple 120V AC plug-in connection
ꢀ8-year warranty
Technical Specifications
GL2.5Ti
GL4Ti
GL8Ti
Tank Volume
Nominal Dimensions
Voltage
2.75 gallons
14" x 14" x 11"
120V
3.85 gallons
14" x 14" x 14"
120V
7.0 gallons
17 ½" x 17 ½" x 14 ½"
120V
Amperage
12.5 amps
Plug-in
12.5 amps
Plug-in
12.5 amps
Plug-in
Wire Type
Heating Capacity
Recovery at 90° rise
Temperature range
Water connections
1500 watts
7 gph
1500 watts
7 gph
1500 watts
7gph
65-145°F
½" NPT
65-145°F
½" NPT
65-145°F
¾" NPT
Maximum water
pressure
150 PSI
150 PSI
150 PSI
Relief valve
Installed
Installed
Included
Bosch Water Heating
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18
Applications manual
3 Domestic Water Heating Applications
Potable water
Potable water is water that is suitable for drinking. Bosch Water
Heating appliances are approved to heat potable water only. Heating
any other liquid other than potable water will void the manufactures
warranty covering the appliance.
Introduction
This chapter covers the various application techniques Bosch Water
Heating recommends. The schematics are to be used by professional
contractors in designing a domestic water heating system. The
applications covered range from single sink point-of-use applications
to multi-appliance central domestic recirculation applications.
3.1 Point-of-use applications
Point-of-use applications cover the small applications that a large
water heater would be inefficient for. Installing a smaller heater at a
point-of-use puts the heater near the hot water demand and reduces
the wait for hot water. Common applications for these appliances
include homes, offices, warehouses, service stations, stores, conces-
sion stands, and summer camps.
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| 19
3.1.1 Ariston mini tank
Simply tap into the cold water line and install the water heater
directly at the sink. All models plug into a standard 120 volt outlet.
Heater can be wall mounted, or sit on the floor.
hot
cold
hot
cold
Ariston Pro GL2.5 Ti
Ariston Pro GL4 Ti
cold
hot
Symbols
Temperature and pressure
relief valve
Sink
Flow direction
Service valve
Ariston Pro GL8 Ti
Drain pan
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # POU1
CN
rev 06/06
Bosch Water Heating
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20
Applications manual
3.1.2 Powerstream Pro electric point-of-use tankless water heater
PowerstreamPro point-of-use water heaters come in four models to
serve a wide range of applications. Finding the right model depends
upon your desired temperature and flow rate. Use the table below to
find the model best suited to your customer‘s needs. Flow controls
and faucet aerators can greatly enhance performance.
Note: Water heater must be filled with water and purged of air prior
to supplying power.
cold supply
hot
Powerstream Pro
RP1P, RP2P, RP3P,
RP7P, RP9P, RP12PT
hot
cold
cold supply
hot
Symbols
Service valve
cold
hot
Powerstream Pro
RP1P, RP2P, RP3P,
RP7P, RP9P, RP12PT
Sink
Flow direction
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # POU2
CN
rev 06/07
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| 21
3.1.3 Bosch GWH-260PN gas tankless water heater
The Bosch GWH-260PN gas tankless water heater offers
a compact and lightweight design for easy installation.
This unit is equipped with standing pilot ignition and is
intended for low volume applications.
Symbols
Temperature and pressure
relief valve
BOSCH
Bosch GWH 260 PN
Service valves
Sink
hot
cold
Flow direction
Low flow
shower
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # POU3
CN
rev 06/07
Bosch Water Heating
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22
Applications manual
3.2 Whole house applications
Whole house applications cover the typical home applications up to
a 2 or 3 bedroom house. See the sizing guide (Section 2.1) to
determine the best Bosch water heater model for your application.
An enhanced design including an Ariston mini tank in line to the hot
water source will reduce the wait time for hot water and improve
temperature stability.
3.2.1 Powerstream Pro whole house applications
The RP17PT and RP27PT must be hard wired directly to the breaker
box.
Powerstream Pro
RP17PT or RP27PT
Hot
Cold
Ariston Pro GL4Ti
for pipe runs over
100 ft, use GL8Ti
Note: place Ariston close to the point of
use to reduce wait time for hot water.
Powerstream Pro
RP17PT or RP27PT
Symbols
Hot
Cold
Standard tub fixture
Flow direction
Service
valves
Sink
Note: Cold water piping to fixtures not shown for clarity purposes.
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # WH1
CN
rev 06/07
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| 23
3.2.2 Powerstream Pro whole house application with domestic
recirculation loop
The circulator should be controlled by an external aquastat, or with
a timer to run only during times of expected hot water usage.
Powerstream Pro
RP17PT or RP27PT
Cold
Hot
Ariston Pro GL4Ti
(for pipe runs over
100ft use GL8Ti)
Symbols
Bronze circulator pump sized
Timer or
Aquastat
Flow check valve
Flow direction
according to UPC standards
(Taco Bronze 007 or Grundfos 15-42B
will cover most homes up to 3 bathrooms)
Potable water
expansion tank
Service
valves
Sink
Standard tub fixture
Note: Cold water piping to fixtures not shown for clarity purposes.
Note: This drawing is conceptual in nature and does to address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # WH1R
CN
rev 06/07
Bosch Water Heating
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24
Applications manual
3.2.3 Bosch ProTankless gas water heater
Below are two examples of Bosch ProTankless gas water heater
installations for the whole house. One example shows an Ariston
mini tank in line for reduced hot water wait time and increased
temperature stability.
Bosch GWH 715 ES,
Bosch GWH C 800 ES,
Bosch GWH 425 HN or
Bosch GWH 425 PN
Hot
Cold
Ariston Pro GL4Ti
for pipe runs over
100 ft, use GL8Ti
Note: place Ariston close to the point of
use to reduce wait time for hot water.
Bosch GWH 715 ES,
Bosch GWH C 800 ES,
Bosch GWH 425 HN or
Bosch GWH 425 PN
Symbols
Standard tub fixture
Pressure
relief
valve
Cold
Hot
Flow
direction
Service
valves
Sink
Note: Cold water piping to fixtures not shown for clarity purposes.
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # WH2
CN
revA 10/07
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| 25
3.2.4 Bosch ProTankless gas water heater with domestic
recirculation loop
The circulator should be controlled by an external aquastat, or with
a timer to run only during times of expected hot water usage.
Hot
Cold
Bosch GWH 715 ES,
Bosch GWH C 800 ES,
Bosch GWH 425 HN or
Bosch GWH 425 PN
Ariston Pro GL4Ti
(for pipe runs over
100ft use GL8Ti)
Symbols
Potable water
expansion tank
Flow
check
valve
Pressure
relief
valve
Sink
Standard
tub
fixture
Bronze circulator sized
Service
valves
Timer or
Aquastat
Flow direction
according to UPC standards
(Taco Bronze 007 or Grundfos 15-42B
will cover most homes up to 3 bathrooms)
Note: Cold water piping to fixtures not shown for clarity purposes.
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # WH2R
CN
rev 06/07
Bosch Water Heating
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26
Applications manual
4 High Volume Potable Water Heating
Potable water
Potable water is water that is suitable for drinking. Bosch Water
Heating appliances are approved to heat potable water only. Heating
any other liquid other than potable water will void the manfuctures
warranty covering the appliance.
Introduction
This section lays out the options for high volume water heating for
large residential and light commercial applications including con-
tinuous flows and high volume demands of large home and
commercial applications.
4.1 Parallel unit applications
Parallel unit applications have twice the activation rate of single unit
applications. The following designs are for continuous flow, high
volume hot water needs. Not intended for residential use. To bal-
ance flows use reverse return piping. (shown below)
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| 27
4.1.1 Bosch ProTankless gas water heater in parallel for
commercial applications
Two Bosch ProTankless units will have double the activation rate of a
single unit. When sizing gas line, ensure the gas line is sized to carry
the BTU load of two units plus any additional gas appliances. See
the installation manuals for a gas line sizing chart.
Bosch GWH 715 ES,
Bosch GWH C 800 ES,
*see text above about
activation rate and
gas supply requirements
hot
cold
hot
cold
Symbols
Pressure
relief
valves
Flow direction
cold
hot
Service
valves
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # P2
CN
revA 10/07
Bosch Water Heating
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28
Applications manual
4.2 Cascading unit applications
A cascading application should be considered if the potential hot
water demand exceeds the capacity of one GWH 715 ES or
GWH C 800 ES. The cascading set up supports variable flow inputs
and is designed for large homes and commercial applications.
4.2.1 GWH 715 ES and GWH C 800 ES cascading
Cascading allows up to two appliances to be connected in parallel.
One of the appliances will serve as the controlling Master appliance
and will attempt to meet the hot water demand. If the hot water
demand is beyond the capacity of the Master appliance, a signal is
sent to the Slave appliance to begin operation.
Bosch GWH 715 ES or
Bosch GWH C 800 ES
• The plumbing must be connected in the reverse
return method with a minimum number of elbows
to aid in balancing pressures between the two
appliances.
• If a domestic recirculation system is desired,
recirculate the water through the Ariston ProTi
water heater as seen in chapter 3.4.
• Locate appliances close together for
improved performance.
tankless link
hot
hot
cold
cold
• Follow industry plumbing practices when installing
multiple appliances
• Minimum pipe diameter: ¾"
• Minimum water pressure: 50 psi
• Maximum distance between appliances: 36"
• Insulate pipes to prevent heat loss.
Symbols
cold
hot
Flow direction
inlet
outlet
Water
hammer
arrestor
Pressure
relief
valve
Ariston Pro GL8Ti
recommended
Service
valves
Tankless
link
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # CA1
CN
revA 10/07
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| 29
4.3 External storage tank loading applications.
Introduction
This section lays out tank loading options for high volume water
heating for large residential and light commercial applications
including continuous flows and high volume demands of large home
and commercial applications.
4.3.1 GWH 345/450 ESR pressure drops and circulator guidelines
ꢀ
ꢀ
ꢀ
The maximum amp draw for any circulator connected directly to
the appliance must not exceed 1.5 amps
Circulator should be sized by the professional plumbing
contractor
Bronze or stainless steel circulators required for all open loop
applications
50 feet of head
40 feet of head
30 feet of head
GWH 345 ESR
20 feet of head
10 feet of head
0 feet of head
0 GPM
1 GPM
2 GPM
3 GPM
4 GPM
5 GPM
6 GPM
water flow rate
50 feet of head
40 feet of head
30 feet of head
20 feet of head
10 feet of head
0 feet of head
GWH 450 ESR
0 GPM
1 GPM
2 GPM
3 GPM
4 GPM
5 GPM
6 GPM
water flow rate
Pressure drop curves
Note : Flow above 6 GPM is not permitted.
Bosch Water Heating
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Applications manual
4.3.2 Single unit tank loading application plumbing diagram
The GWH 345/450 ESR is specifically designed for this application.
Cold water
DHW
feed
Bosch GWH 345 ESR,
Bosch GWH 450 ESR
PS
Symbols
External
storage
tank
Potable water
expansion tank
Pressure
relief
valve
Flow
direction
Bronze circulator sized
according to UPC standards
12K ohm
thermistor
with immersion
well
Service
valves
Note: Piping to fixtures not shown for clarity purposes.
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # STL
CN
revA 10/07
Application manual | 11.2007
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| 31
4.3.2 Single unit tank loading application electrical diagram
The following shows the appropriate electrical connections for
plumbing diagram 4.3.2
Terminal box
110VAC from outlet
PK P0 PS PE
L
N
LL
N
L
ESR control
board
PS
PCB
Single Unit Tank Loading
Electrical Diagram
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # ESTL
CN
revA 10/07
Bosch Water Heating
Applications manual | 11.2007
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32
Applications manual
5 Open Loop Space Heating
5.1 External storage tank
Introduction
This section is designed to provide a road map of techniques for
using a tankless water heater to heat domestic water and at the
same time provide space heating in residential applications. As with
all installations, check with the local authority having jurisdiction.
Some jurisdictions may not allow these types of applications.
The appliances shown in this section are approved under ANSI
Z21.10.3 and CSA 4.3 as circulating gas water heaters. Only open
loop applications are approved under this standard.
5.1.1 Radiant space heating and DHW plumbing diagram
Bosch GWH 345 ESR,
Bosch GWH 450 ESR
DHW
Cold water
feed
P2
P1
PS
Symbols
Storage
tank
Radiant
piping
Potable water
expansion tank
Flow
direction
Pressure
relief
valve
Bronze circulator
sized according to
UPC standards
12K ohm
thermistor
with immersion
well
Thermossttatic
mixing
vallvee
Service
valves
Note: Piping to fixtures not shown for clarity purposes.
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # ROL
CN
revA 10/07
Application manual | 11.2007
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| 33
5.1.1 Radiant space heating and DHW electrical diagram
The following shows the appropriate electrical connections for
plumbing diagram 5.1.1
Terminal box
110VAC from outlet
PK P0 PS PE
L
N
LL
N
L
ESR control
board
PS
PCB
T
Stat
T
Stat
24 VAC
POWER
ZONE1 ZONE2
TWO ZONE SWITCHING RELAY
SR 502
FUSE 1 AMP
X2
N
P
ZC
H
X1 ZR
ZONE1 ZONE2
Neutral
120Vac
P1
P2
Radiant Space Heating and DHW
Electrical Diagram
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # EROL
CN
revA 10/07
Bosch Water Heating
Applications manual | 11.2007
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34
Applications manual
5.1.2 Fan coil space heating and DHW plumbing diagram
Bosch GWH 345 ESR,
Bosch GWH 450 ESR
DHW
Cold water
feed
Fan Coil
P1
PK
Symbols
Potable water
expansion tank
Flow
check
valve
Storage
tank
Fan Coil
Pressure
relief
valve
Air
seperator
Bronze circulator
sized according to
UPC standards
Thermostatic
mixing
valve
Service
valves
Flow
direction
Tank
Aquastat
Note: Piping to fixtures not shown for clarity purposes.
Note: This drawing is conceptual in nature and does to address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # FCOL
CN
revA 10/07
Application manual | 11.2007
Bosch Water Heating
Download from Www.Somanuals.com. All Manuals Search And Download.
Applications manual
| 35
5.1.2 Fan Coil space heating and DHW electrical diagram
The following shows the appropriate electrical connections for plumbing diagram 5.1.2
Terminal box
110VAC from outlet
PK P0 PS PE
L
N
LL
N
L
ESR control
board
PK
T
Stat
SR501
24
TT
1 ZONE
R
T
W
T
VAC
SWITCHING RELAY
COM
LR
LS
120 VAC
INPUT
4
4
6
6
N
H
3
5
N/O
N/C
N/C
N/O
Neutral
120Vac
AQUASTAT
P1
Fan Coil Space Heating and DHW
Electrical Diagram
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # EFCOL
CN
revA 10/07
Bosch Water Heating
Applications manual | 11.2007
Download from Www.Somanuals.com. All Manuals Search And Download.
|
36
Applications manual
5.1.3 Baseboard/ Radiant Panel space heating and DHW plumbing diagram
Bosch GWH 345 ESR,
Bosch GWH 450 ESR
DHW
Cold water
feed
P1
PK
Symbols
Potable water
Flow
Flow
direction
Storage
tank
Baseboard/
Radiant
Panel
expansion tank
check
valve
Pressure
relief
valve
Air
seperator
Tank
Aquastat
Bronze circulator
sized according to
UPC standards
Thermostatic
Mixing
valve
Service
valves
Note: Piping to fixtures not shown for clarity purposes.
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # BB
OL
CN
revA 10/07
Application manual | 11.2007
Bosch Water Heating
Download from Www.Somanuals.com. All Manuals Search And Download.
Applications manual
| 37
5.1.3 Baseboard/Radiant Panel space heating and DHW electrical diagram
The following shows the appropriate electrical connections for plumbing diagram 5.1.3
Terminal box
110VAC from outlet
PK P0 PS PE
L
N
LL
N
L
ESR control
board
PK
T
Stat
24 VAC
POWER
TT
ZONE1 ZONE2 ZONE3
THREE ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
SR 503
or equivalent
LR
LS
FUSE 1 AMP
X2
N
P
ZC
H
X1 ZR
ZONE1 ZONE2 ZONE3
Neutral
120Vac
AQUASTAT
P1
Baseboard Space Heating and DHW
Electrical Diagram
Note: This drawing is conceptual in nature and does not purport to address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # EBBOL
CN
revA 10/07
Bosch Water Heating
Applications manual | 11.2007
Download from Www.Somanuals.com. All Manuals Search And Download.
|
38
Applications manual
5.1.4 Baseboard/ Radiant Panel space heating and DHW (with Ariston mini tank) plumbing diagram
Bosch GWH 345 ESR,
Bosch GWH 450 ESR
PK
PS
Cold waterfeed
Aquastat
well with
12k ohm
DHW
thermistor
(insulate piping
around thermistor)
Cold water
feed
Symbols
Baseboard/
Radiant
Panel
Flow
check
valve
Potable
water
expansion tank
Ariston GL8Ti
mini water
tank
Pressure
relief
valve
Aquastat
well & 12kohm
thermistor
Bronze circulator
sized according to
UPC standards
Thermostatic
mixing
valve
Service
valves
Flow
direction
Note: Piping to fixtures not shown for clarity purposes.
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # BBAOL
CN
revA 10/07
Application manual | 11.2007
Bosch Water Heating
Download from Www.Somanuals.com. All Manuals Search And Download.
Applications manual
| 39
5.1.4 Baseboard/Radiant Panel space heating and DHW (with Ariston mini tank) electrical diagram
The following shows the appropriate electrical connections for plumbing diagram 5.1.4
Terminal box
110VAC from outlet
PK P0 PS PE
L
N
LL
N
L
ESR control
board
PK
PS
PCB
TT
LR
LS
Room Thermostat
Baseboard/Radiant Panel Space Heating and DHW (with Ariston mini tank)
Electrical Diagram
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # EBBAOL
CN
revA 10/07
Bosch Water Heating
Applications manual | 11.2007
Download from Www.Somanuals.com. All Manuals Search And Download.
|
40
Applications manual
5.1.5 Baseboard/ Radiant Panel space heating and DHW (without storage tank) plumbing diagram
Bosch GWH 345 ESR,
Bosch GWH 450 ESR
PK
Insulate
piping
DHW
PS
Cold water
feed
Symbols
Baseboard/
Radiant
Panel
Flow
check
valve
Flow
direction
Piping
Insulation
Aquastat
well & 12kohm
thermistor
Pressure
relief
valve
Bronze circulator
sized according to
UPC standards
Service
valves
Thermostatic
mixing
valve
Note: Piping to fixtures not shown for clarity purposes.
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # BBNTOL
CN
revA 10/07
Application manual | 11.2007
Bosch Water Heating
Download from Www.Somanuals.com. All Manuals Search And Download.
Applications manual
| 41
5.1.5 Baseboard/Radiant Panel space heating and DHW (without storage tank) electrical diagram
The following shows the appropriate electrical connections for plumbing diagram 5.1.5
Terminal box
110VAC from outlet
PK P0 PS PE
L
N
LL
N
L
ESR control
board
PK
PS
PCB
Baseboard/Radiant Panel Space Heating and DHW
Without Storage Tank Electrical Diagram
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # BBNTOL
CN
revA 10/07
Bosch Water Heating
Applications manual | 11.2007
Download from Www.Somanuals.com. All Manuals Search And Download.
|
42
Applications manual
5.2 Indirect Tank Applications
5.2.1 Indirect Baseboard/ Radiant Panel space heating and DHW plumbing diagram
Note: Not suitable for space heating applications requiring high water temperature.
Bosch GWH 345 ESR,
Bosch GWH 450 ESR
Cold water
feed
DHW
P1
Cold
feed
PK
Symbols
Potable water
expansion tank
Baseboard/
Radiant
Panel
Flow
Flow
Indirect
hot water
tank
direction
check
valve
Pressure
relief
valve
Tank
Aquastat
Air
seperator
Bronze circulator
sized according to
UPC standards
Pressure
reducing
valve
Thermostatic
Mixing
valve
Service
valves
Back Flow
preventer
Note: Piping to fixtures not shown for clarity purposes.
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # IDBBOL
CN
revA 10/07
Application manual | 11.2007
Bosch Water Heating
Download from Www.Somanuals.com. All Manuals Search And Download.
Applications manual
| 43
5.2.1 Baseboard/Radiant Panel space heating and DHW electrical diagram
The following shows the appropriate electrical connections for plumbing diagram 5.2.1
Terminal box
110VAC from outlet
PK P0 PS PE
L
N
LL
N
L
ESR control
board
PK
T
Stat
24 VAC
POWER
TT
ZONE1 ZONE2 ZONE3
THREE ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
SR 503
or equivalent
LR
LS
FUSE 1 AMP
X2
N
P
ZC
H
X1 ZR
ZONE1 ZONE2 ZONE3
Neutral
120Vac
AQUASTAT
P1
Indirect Baseboard/Radiant Panel Space Heating and DHW
Electrical Diagram
Note: This drawing is conceptual in nature and does not address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # EID BBOL
CN
revA 10/07
Bosch Water Heating
Applications manual | 11.2007
Download from Www.Somanuals.com. All Manuals Search And Download.
|
44
Applications manual
6 Maintenance Drawings
Bosch appliances are designed to last for many years. In order to keep the heater operating properly, periodic maintenance is required.
Please consult the installation manual for maintenance intervals. A descaling procedure drawing is included to assist in clearing the water
heater of mineral deposits that may build up over time.
6.1 Descaling procedure
This procedure should only be done if there is evidence of scale build-up such as a reduced hot water flow rate or if the water is known to
have high levels of minerals such as calcium.
1. Disconnect electrical supply from the water heater.
2. Shut off the water supply to the water heater using (installer supplied) isolation valve.
3. Open hot water taps to drain and relieve pressure from the plumbing system.
4. Drain water from the unit’s heat exchanger by disconnecting inlet and outlet water connections.
5. Connect the line (A) from the outlet of the circulating pump (installer supplied) to the inlet water fitting on the water heater.
6. Using another line (B), connect to the water outlet fitting on the water heater. Route the other end of this line into a descaling reser-
voir.
7. Using a 3rd line (C) from the descaling reservoir, connect to the inlet side of circulating pump. Verify there is a filter on the end of the
line in the descaling reservoir.
8. Make sure all connections are “hand tight.”
9. Fill tank with descaling solution so lines inside are submersed. We recommend a straight white vinegar. If using a commercial descalant,
refer to manufacturer’s instructions for proper dilution ratio.
11. Operate the circulating pump.
12. Make sure there are no leaks and the solution is flowing from the descaling reservoir through the heat exchanger and returning to the
reservoir.
13. Run solution through the heat exchanger until the solution returning to the descaling reservoir comes out clear. (Changing to a fresh
solution may be necessary during this process)
14. Disconnect all lines and drain all solution from heat exchanger. Properly discard of solution.
15. Position a container below the hot water outlet and connect cold water supply. Open cold water supply isolation valve and flush heat
exchanger with clean water.
16. Shut cold water isolation valve and reconnect hot water supply to the water heater.
17. Reconnect electrical supply to unit, open water isolation valves, and return the unit to service.
Application manual | 11.2007
Bosch Water Heating
Download from Www.Somanuals.com. All Manuals Search And Download.
Applications manual
| 45
6.1 Descaling procedure diagram
Bosch GWH 715 ES,
Bosch GWH C 800 ES,
Bosch GWH 425 HN or
Bosch GWH 425 PN
Symbols
Circulating
pump
B
Flow direction
Filter
C
A
Service
valves
Note: This drawing is conceptual in nature and does not purport to address all design, installation or safety considerations.
Additional safety and/or auxiliary equipment may be needed. This diagram is for reference use by officials, designers and licensed installers.
It is expected that installers have adequate knowledge of accepted industry practices for the equipment, procedures, and applications involved.
Drawing is not to scale.
Drawing # MD1
CN
revA 10/07
Bosch Water Heating
Applications manual | 11.2007
Download from Www.Somanuals.com. All Manuals Search And Download.
|
46
Applications manual
Application manual | 11.2007
Bosch Water Heating
Download from Www.Somanuals.com. All Manuals Search And Download.
Applications manual
| 47
Bosch Water Heating
Applications manual | 11.2007
Download from Www.Somanuals.com. All Manuals Search And Download.
|
48
Applications manual
Application manual | 11.2007
Bosch Water Heating
Download from Www.Somanuals.com. All Manuals Search And Download.
Applications manual
| 49
Bosch Water Heating
Applications manual | 11.2007
Download from Www.Somanuals.com. All Manuals Search And Download.
BBT North America Corporation
Bosch Group
Bosch Water Heating
50 Wentworth Ave
Londonderry, NH 03053
Telephone (603) 882-1100
Fax (603) 584-1681
Download from Www.Somanuals.com. All Manuals Search And Download.
|