Gas Hot Water Supply Heaters
Available in Indoor and Outdoor Models
ꢀ
136,000 thru 1,826,000 BTU/Hr.
Rheem-Ruud hot water supply heaters are designed to pro-
vide hot water service to a variety of commercial applications
when used in conjunction with an appropriately sized storage
tank. These models are particularly suited for applications that
require high inputs and large volumes of stored hot water.
Construction Features:
• Reliable heat exchanger
Design – The all copper
heat exchanger is a single
bank, straight-through
design with a floating
return header immune to
thermal shock.
• Compact design –
The low water heater
mass design offers
substantial savings in
weight and cube over
most cast iron, steel tube
and storage-type water
heaters making it ideal
for rooftop installations
and in tight quarters.
• Energy saving pump
control – The energy
saving pump control is an
electric device that allows
the operator to set the
desired time for the pump
to run after the water
• Minimal heat loss design
– Spark-to-pilot (IID)
system is standard on
all models.
heater shuts off. With the
energy saving pump con-
trol the water heater pump
is programmed to contin-
ue running for an optimum
period of time in order to
absorb the residual heat
from the combustion
• Glasslined cast iron
headers –
To handle aggressive
water conditions. (Models
GBBP/GBB136 feature
bronze headers.)
chamber and use it in the
system.
Indoor Models
Certifications and Ratings:
Indoor and Outdoor
Models
•
Efficiency – These models have been tested according to ANSI
test procedures, and meet or exceed the 80% thermal efficiency
requirement of current ASHRAE standards (Part of the Federally
mandated Energy Policy Act (EPact)). Also exceeds energy
efficiency codes of all states.
Pump Mounted Models
Available
5 Year Limited Warranty
•
Safety and Construction – These products are design certified
by the CSA: a) As a Hot Water Supply Water Heater equipped
with on/off controls for use in conjunction with a storage tank. b)
For operation at 180°F. c) To meet all safety and construction
requirements of ANSI Z21.10.3.c) For installation on combustible
flooring when used with a combustible floor base, and, or e) for
alcove installation. ASME construction is standard on all models.
Certified for a 160 PSI Maximum Working Pressure.
Continued next page.
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Example System
INDOOR
MODELS
OUTDOOR
MODELS
•• OPTIONAL
INTEGRAL PUMP
ON MODELS 512 - 1826
HOT WATER SUPPLY
THERMOMETER
RECIRCULATION
COLD WATER
RECIRCULATION
PUMP
(BY OTHERS)
TANKSTAT
LOCATION
A
DRAIN
OPENING
KEY
PRESSURE
WATER HEATER
SHOWN REPRE-
SENTS VARIOUS
MODELS.
BECAUSE MOD-
ELS WILL VARY IN
DRAFT HOOD
RELIEF VALVE
UNION
PUMP AND BALL VALVE LOCATION ON
MODELS 136 THRU 399
BALL VALVE
GATE VALVE
MINIMUM PIPE SIZE
•• OPTIONAL ON MODELS
Model
Size
Dimension
512 THRU 1826 WITHOUT INTEGRAL PUMP
A
1-1/4"
1-1/2"
2"
DESIGN AND SIZE.
SEE SPECIFIC
WATER HEATER
INFORMATION
FOR DETAILS.
CHECK VALVE
PUMP
136
NOTES:
1. PLUMB SWING CHECK VALVE IN GRAVITY CLOSED POSITION.
2. MINIMUM PIPE EQUAL TO WATER HEATER INLET/OUTLET
CONNECTION SIZE BETWEEN WATER HEATER AND TANK(S)
3. PIPE ALL RELIEF VALVES TO DRAIN, OR AS LOCAL CODES
REQUIRE
186-399
512-825
926-1826
2-1/2"
Guaranteed 80% draw without temperature drop,
using Rheem-Ruud water heaters, tanks, sizing tables and hook-up data.
JACKET INSULATED STORAGE TANKS BY RHEEM-RUUD (All dimensions shown in inches)
Connections
Approx. Shipping
Weight (Lbs.)
Capacity
Gallons
Overall
Height
Connection
Hot Outlet
Circulating
Line
Relief Valve
Connection
Model
Diameter
24-7/16
28-1/4
32-1/4
32
Standard
220
ASME
260
ST80(A)
ST120(A)
ST175(A)
ST200A
ST260A
ST320A
ST430A
ST500A
ST750A
ST950A
80
58-5/16
59-1/4
67-1/4
77-1/4
95-1/2
84-1/2
84-1/2
94-1/2
107-1/2
131-1/2
2
2
1
115
175
200
257
318
432
504
752
940
2
2
1
260
340
2-1/2
2-1/2
1
600
600
2
2
2
2
2
2
2
2-1/2
1
N/A
500
34
3
3
3
3
3
3
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
N/A
1108
1290
1626
1765
2330
3010
40
N/A
46
N/A
46
N/A
54
N/A
54
N/A
These storage tanks meet standby loss requirements of ASHRAE 90.1b-1992.
(A) ASME code constructed tanks available as an option.
Consult specification sheet for complete details.
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SPECIFICATIONS AND DIMENSIONS
MODEL NUMBER
With-
STYLE
MBTUH NATURAL GAS (X 1000)
DIMENSIONS (INCHES)
SHIPPING WEIGHT††
Ref.
to
Dwg.
Height Jacket
Gas
Flue
Dia.
K
out
Pump
With
Pump
In-
Out-
(indoor)
(outdoor)
Width Overall Height Conn.
door door Input Output Input Output
A
B
C
G
J
L
91⁄
M
N
(Indoor)
195
191
214
234
253
510
520
630
660
–
(Outdoor)
195
200
220
240
260
535
545
685
720
790
–
1
1
GBB136*
GBBP136*
•
•
•
•
136.0
181.0
264.0
334.0
399.0
511.5
627.0
726.0
825.0
–
112.0
148.0
216.0
274.0
327.0
419.4
514.1
595.4
676.5
–
136.0 112.0
181.0 148.0
264.0 216.0
334.0 274.0
399.0 327.0
511.5 419.4
627.0 514.1
726.0 595.4
825.0 676.5
926.0 759.3
241⁄
181⁄
223⁄
253⁄
291⁄
323⁄
371⁄
415⁄
453⁄
523⁄
523⁄
591⁄
591⁄
635⁄
635⁄
685⁄
685⁄
747⁄
747⁄
811⁄
811⁄
893⁄
893⁄
8
45.0
40.0
40.0
40.0
40.0
57.0
57.0
57.0
57.0
–
301⁄
38
38
38
38
33
33
33
33
–
8
⁄
2
–
6
6
7
8
9
4
101⁄
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
4
31⁄
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
2
3
GBC186** GBCP186**
GBC264** GBCP264**
GBC331** GBCP331**
GBC399** GBCP399**
4
⁄
4
121⁄
111⁄
103⁄
16
–
3
•
•
8
⁄
4
8
–
2
3
•
•
4
⁄
4
4
–
3
•
•
4
⁄
4
121⁄
2
–
GBC512
GBC627
GBC726
GBC825
GBC926
GBC962
GBCP512
GBCP627
GBCP726
GBCP825
GBCP926
GBCP962
•
•
4
1
1
1
1
1
1
1
1
1
1
11⁄
11⁄
11⁄
11⁄
11⁄
11⁄
11⁄
11⁄
–
10 253⁄
12 291⁄
12 341⁄
14 381⁄
8
•
•
2
–
2
3
•
•
8
–
4
•
•
4
–
2
–
•
•
8
–
–
14
–
–
28
–
–
•
961.7
–
788.6
–
–
–
8
683⁄
4
331⁄
2
18
760
–
GBC1083 GBCP1083
GBC1125 GBCP1125
GBC1178 GBCP1178
GBC1223 GBCP1223
GBC1287 GBCP1287
GBC1337 GBCP1337
GBC1413 GBCP1413
GBC1467 GBCP1467
GBC1570 GBCP1570
GBC1630 GBCP1630
GBC1758 GBCP1758
GBC1826 GBCP1826
–
•
1083.0 888.1
4
–
741⁄
–
–
850
–
–
•
1124.7 922.2
–
–
4
2
331⁄
–
2
255⁄
–
235⁄
8
16
–
32
–
800
–
–
•
–
–
1178.0 966.0
8
–
910
–
–
•
1222.5 1002.4
–
–
8
741⁄
–
761⁄
2
331⁄
2
8
16
–
32
–
860
–
–
•
–
–
1287.0 1055.3
8
–
4
–
975
–
4
–
•
1336.6 1096.0
–
–
8
2
331⁄
–
2
4
235⁄
–
235⁄
8
18
–
36
–
930
–
–
•
–
–
1413.0 1158.7
8
–
4
1065
–
–
•
1467.0 1202.9
–
–
8
761⁄
–
791⁄
2
331⁄
2
4
8
18
–
36
–
1000
–
–
•
–
–
1570.0 1287.4
8
–
4
–
1120
–
–
•
1630.0 1336.5
–
–
8
2
361⁄
–
2
4
235⁄
–
235⁄
8
18
–
36
–
1040
–
–
•
–
–
1758.0 1441.6
8
–
811⁄
4
1150
–
–
1825.6 1496.9
–
–
8
2
361⁄
2
4
8
20
40
1090
* Equipped with bronze headers, all other models have glasslined cast iron headers. GBC – cast iron headers. GBB – bronze headers.
†† Subtract 55 lbs. when ordering GBC models.
** Low NOx models add “N” after model number. Outdoor models add “-O” after model number.
Indicate Natural or LP when ordering.
MBTUH PROPANE GAS†
MIN. CLEARANCES TO COMBUSTIBLE SURF.
ELECTRICAL RATINGS
With Pump
Top
Side Indoor Outdoor
Model
Size
Model
Size
Left
Side
Right
Model
Size
Multiplier
Same as natural gas
.94
Rear
12"
136-399
512-825
926-1826
136
12"
12"
18"
24"
6"
12"
6"
42"
39"
36"
24"
Unobstr.
Unobstr.
Unobstr.
Unobstr.
136-399
331-399
512-1826
3.7 amps @ 120V (1/8 hp pump)
3.6 amps @ 120V (1/6 hp pump)
7.2 amps @ 120V (1/2 hp pump)
186-399
512-825
926-1826
12"
.92 Indoor
12"
.955 Outdoor (input)
.92 Outdoor (output)
24"
24"
For servicing provide 24" minimum unobstructed clearance
in front of unit.
† Multiplier x Nat. MBTUH = Pro. MBTUH
141/2
A
K
71/4
K
L
101/2
PUMP
(OPTIONAL)
INDOOR
OUTDOOR
PUMP COVER
(OPTIONAL
OUTDOOR
UP FRONT
CONTROLS
11/4
J
INLET
MODELS ONLY)
OUTLET
68-3/4
B
INDOOR
DRAFT
ELEC.
CONN.
381/2
(B)
OUTLET
9-7/8
G
GAS
STACKLESS
(C)
OUTDOOR TOP
INLET
C
26-1/2
241/4
10-1/4
1-1/2 NPT
WATER
CONNECTION
REAR VIEW
FRONT VIEW
153/8
2
3-7/8
8-1/2
A
3/4 NPT
13-1/4
GAS
CONNECTION
COMBUSTIBLE
FLOOR SHIELD
21-1/4
ELECTRIC
CONNECTION
GAS
4 7/8
26-1/2
31/4
2
CONNECTION
OPTIONAL
ON INDOOR
4 3/4
DRAWING 1
DRAWING 2
291/2
K
A
18
321/2
A
18
A
2
A
2
K
111/4
143/4
L
18
INDOOR OUTDOOR
2
J
INDOOR
OUTDOOR
21/2
B
B
441/8
G
OUTLET INLET
GAS
463/4
C
141/2
OUTLET INLET
141/2
113/4
281/4
G
GAS
C
ELEC
CONN
ELEC
CONN
273/4
17
14
COMBUSTIBLE
FLOOR SHIELD
6
21/2
51/8
11/8
COMBUSTIBLE
FLOOR SHIELD
21/4
5/8
21/4
111/8
5
1
11 /8
6
5
OPTIONAL
OPTIONAL
ON INDOOR
ON INDOOR
DRAWING 3
DRAWING 4
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RECOVERY CAPACITIES
MODEL NUMBER
STYLE
Indoor Outdoor
TEMPERATURE RISE – DEGREES F – GALLONS PER HOUR
40° 50° 60° 70° 80° 90° 100° 110° 120° 130° 140°
INPUT BTU/Hr.
NATURAL
wo/Pump w/Pump
GBB136
GBC186
GBC264
GBC331
GBC399
GBC512
GBC627
GBC726
GBC825
GBC926
GBC962
GBBP136
GBCP186
GBCP264
GBCP331
GBCP399
GBCP512
GBCP627
GBCP726
GBCP825
GBCP926
GBCP962
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
136,000
181,000
330 264 220 188 165
440 352 293 251 220
640 512 427 366 320
811 649 541 463 406
967 774 645 553 484
1240 992 827 709 620
1520 1216 1013 869 760
1760 1408 1173 1006 880
147 132
195 176
284 256
360 324
430 387
551 496
676 608
782 704
120
160
233
295
352
451
553
640
727
816
848
110
147
213
270
322
413
507
587
667
748
777
875
909
101
94
135 126
197 183
250 232
298 276
382 354
468 434
542 503
615 571
691 641
717 665
808 750
839 779
879 816
912 847
264,000
334,000
399,000
511,500
627,000
726,000
825,000
2000 1600 1333 1143 1000 889 800
2245 1796 1497 1283 1122 998 898
2331 1865 1554 1332 1166 1036 933
926,000
*
*
*
*
*
*
*
961,700
GBC1083 GBCP1083
GBC1125 GBCP1125
GBC1178 GBCP1178
GBC1223 GBCP1223
GBC1287 GBCP1287
GBC1337 GBCP1337
GBC1413 GBCP1413
GBC1467 GBCP1467
GBC1570 GBCP1570
GBC1630 GBCP1630
GBC1758 GBCP1758
GBC1826 GBCP1826
*
*
*
*
*
*
1,083,000
1,124,700
1,178,000
1,222,500
1,287,000
1,336,600
1,413,000
1,467,000
1,570,000
1,630,000
1,758,000
1,825,600
2625 2100 1750 1500 1313 1167 1050 955
2727 2181 1818 1558 1363 1212 1091 991
2856 2285 1904 1632 1428 1269 1142 1038 952
2964 2371 1976 1694 1482 1317 1185 1078 988
3120 2496 2080 1783 1560 1387 1248 1135 1040 960 891
3240 2592 2160 1852 1620 1440 1296 1178 1080 997 926
3425 2740 2284 1957 1713 1522 1370 1246 1142 1054 979
3556 2845 2371 2032 1778 1581 1423 1293 1185 1094 1016
3806 3045 2537 2175 1903 1692 1522 1384 1269 1171 1087
3952 3161 2634 2258 1976 1756 1581 1437 1317 1216 1129
4262 3409 2841 2435 2131 1894 1705 1550 1421 1311 1218
4426 3541 2950 2529 2213 1967 1770 1609 1475 1362 1264
GENERAL FLOW AND PIPING SPECIFICATIONS
Water Hardness
MEDIUM
MODELS
SOFT
HARD
0-4 Grains Per Gallon
5-15 Grains Per Gallon
16 & Over Grains Per Gallon
Indoor
136
186
Outdoor
136
GPM
10
20
20
20
22
42
41
41
45
53
61
67
73
80
89
90
MPS SHL
1-1/4 5.09
GPM
13
26
26
26
26
52
54
60
68
79
90
90
90
90
90
90
MPS SHL
GPM
22
40
42
42
43
84
90
90
90
90
90
90
90
90
90
90
MPS SHL
ꢁT
ꢁP
ꢁT
ꢁP
ꢁT
ꢁP
22
3.4
17
5.5
1-1/4
1-1/2
1-1/2
1-1/2
1-1/2
2
8.2
7.5
7.6
7.7
7.8
7
10
14.7 1-1/4
22
17
186
15
21
27
30
20
25
29
30
30
30
30
30
30
30
32
1.82 1-1/2 4.48
1.85 1-1/2 4.51
11
16
20
25
16
19
20
20
20
20
22
24
26
29
32
3
7
6.8
8.3
8.5
9
1-1/2
264
264
3.1
3.2
3.3
2.9
3.1
4
10
13
15
10
11
13
15
17
20
22
24
26
29
32
1-1/2 18.8
1-1/2 19
1-1/2 19.5
331
331
1.9
2.1
1.8
1.9
2
1-1/2 4.56
1-1/2 5.08
399
399
512
512
2
2
4.4
4.5
4.6
5.7
4.9
7.5
8.8
11
6.8
8.5
9
2
2
2
2
16.6
20.4
20.8
21.1
627
627
2
7.2
9.3
11.7
726
726
2
2
825
825
2.5
3.5
5.5
6.5
8.4
2
5.2
7.5
2
9.3
962
926
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2 10.5
16
2-1/2 16.2
13.3 2-1/2 17.5
10.1 2-1/2 14.3
11.8 2-1/2 16
12 2-1/2 16.2
13.3 2-1/2 17.5
1125
1223
1337
1467
1630
1826
1083
1178
1287
1413
1570
1758
11.8 2-1/2
12
10.8 2-1/2 14.1
13.7 2-1/2 17.6
15.5 2-1/2 19.7
13.8 2-1/2
14.8 2-1/2
18
19
13.8 2-1/2
14.8 2-1/2
18
19
15.5 2-1/2 19.7
15.5 2-1/2 19.7
NOTE: Additional pipe fittings will increase the system head loss. Select a pump based on the water hardness, flow and system head loss. If water heater is
more than two stories above the tank, consult the pump manufacturer.
T
GPM
–
–
–
–
–
Temperature Rise, Degree F @ GPM Flow
Gallons per Minute Flow
Pressure Drop, Ft. thru Heat Exchanger
Minimum Pipe Size, NPT
Sizing based on water heater and tank being placed 5 feet apart. The
equivalent length of pipe valves and fittings in the system is as follows.
ꢁ
1-1/4" NPT = 65 Ft (136)
P
MPS
SHL
ꢁ
1-1/2" NPT = 70 Ft (186-399)
2"
NPT = 75 Ft (512-825)
System Head Loss
2-1/2" NPT = 80 Ft (926-1826)
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Gas Hot Water Supply Heaters
Standard Equipment:
Heat Exchanger
Gas Control Train
• Finned Copper Tubes
• Manual Gas Shut-Off Cock
• Main Gas Pressure Regulator
• Safety Shut-Off Valve, Redundant
• Control Valve
• ASME Steel Tubesheet
• Silicon O-Rings
• 125 PSIG ASME Pressure Relief Valve
• Glasslined Cast Iron Headers
Construction
• Vent Terminal
• Front Controls Enclosed
• Stainless Steel Burners
• Polytuf Powder Coat Finish
Controls
• Energy Saving Pump Control
• Flow Switch
• Spark-to-Pilot Ignition System
• High Limit Control
When ordering specify:
• On/Off Switch
I wo/Pump (GBC) or I w/Pump (GBCP)
• Flue Gas Spillage Sensor
• Flame Roll-Out Sensor
I Natural Gas
I Indoor
or I L.P.
or I Outdoor
Recommended Specifications:
Hot Water Supply Heater(s) shall be model ________________, manufactured by RHEEM-RUUD,
having gas input of __________ Btu/hr. and recovery rate of _____________ GPH at a 100°F tempera-
ture rise when tested and certified at ____________ thermal efficiency. Water heaters(s) shall have the
CSA seal of certification and supplied with a factory installed 125 PSIG ASME pressure relief valve.
Water heater(s) shall meet or exceed the thermal efficiency requirements of ASHRAE. Water heater(s)
shall be ASME inspected and stamped for 160 PSI working pressure complete with manufacturer’s data
report. Water tube heat exchanger shall be constructed of straight integral copper fin tubes with fins
spaced at seven fins per inch. Tube sheets shall be ASME fire box steel. Headers shall be of glasslined
cast iron and joined to the copper tubes and tube sheets by means of silicone “O” rings to form a posi-
tive seal between the copper tubes and the headers to 1200 PSI hydrostatic pressure. Headers shall be
secured to the tube sheets by properly spaced bolts and flange nuts. Heat exchanger shall be readily
cleanable from either the right or left sides (or rear) of the water heater by removing header(s), and on
the right side, cleanable without removing external piping. Heat exchanger to be explosion proof on the
water side. Waterways to be 100% copper and glasslined cast iron to prevent galvanic action within the
water heater by positively sealing off water contact between ferrous and non-ferrous metals. Pump, flow
switch, and energy saving pump control are to be factory supplied and units over 400,000 Btu/Hr. must
have electronic intermittent pilot ignition.
Water heater to be equipped with remote bulb electric high limit control adjustable to 200°F. Main
electric gas valve to be 24 volt with 110/24 volt transformer. Gas pressure regulator to be factory set
at 4" W.C. Flame supervision shall be either 60 second thermopilot or 1-4 second electronic shut down.
Burners to be raised port and die formed from stainless steel alloy, mounted on a removable drawer,
capable of quiet ignition and extinction, and equipped with fixed primary air ports.
Models above 330,000 Btu/Hr. shall be CSA design certified for a minimum efficiency of 82% on indoor
and outdoor models.
Limited Warranty
All GB models feature a five year limited warranty on the
copper heat exchanger and glasslined cast iron header.
Please refer to Commercial Warranty Information brochure
for complete limited warranty information.
C O M M E R C I A L
W A T E R H E A T E R S
In keeping with its policy of continuous progress and product improvement, Rheem-Ruud reserves the right to make changes without notice.
PRINTED IN U.S.A
10/06 WP
FORM NO. RR102C-6 Rev. 11
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