Specification

PRINTED IN U.S.A. 06/17 WP FORM NO. RR102C-12 Rev. 6
2
In keeping with its policy of continuous progress and product improvement, Rheem reserves the right to make changes without notice.
Water
INTEGRATED HOME COMFORT
Commercial Gas
Universal Ultra Low NOx Water Heaters
I N TEGR ATED AIR & WATER
INTEGRATED HOME COMFORT
MODEL INPUT THERM.
GPH
NUMBER BTU/H EFF. 40°F 50°F 60°F 70°F 80°F 90°F 100°F 110°F 120°F 130°F 140°F
GNU75-125 125,000 80% 303 242 202 173 152 135 121 110 101 93 87
GNUU82-156 156,000 80% 378 303 252 216 189 168 151 138 126 116 108
GNU37-200 199,900 82% 485 388 323 277 242 215 194 176 162 149 138
GNU76-200 199,900 80% 485 388 323 277 242 215 194 176 162 149 138
GNU91-200 199,900 82% 485 388 323 277 242 215 194 176 162 149 138
GNU100-200(A) 199,900 82% 485 388 323 277 242 215 194 176 162 149 138
GNU72-250(A) 250,000 80% 606 485 404 346 303 269 242 220 202 186 173
GNU100-250(A) 250,000 82% 606 485 404 346 303 269 242 220 202 186 173
GNU100-270(A) 270,000 82% 655 524 436 374 327 291 262 238 218 201 187
GNU65-360(A) 360,000 80% 873 698 582 499 436 388 349 317 291 269 249
GNU100-400(A) 399,900 80% 969 776 646 554 485 431 388 353 323 298 277
RECOVERY CAPACITIES
(Up to 82% thermal efficiency)
TEMP. RISE AT 100°F IN GALLONS MIN.
MODEL TANK CAP. INPUT
5 10 15 20 30 45 60 120 180
TO REC.
NUMBER GALLONS BTU/H MIN. MIN. MIN. MIN. MIN. MIN. MIN. MIN. MIN.
CONTENTS
GNU75-125 75 125,000 63 73 83 93 113 143 174 295 416 37
GNU82-156 82 156,000 70 83 95 108 133 171 209 360 511 33
GNU37-200 35 199,900 41 56 72 88 119 167 214 403 562 11
GNU76-200 76 199,900 69 86 102 118 150 199 247 441 635 24
GNU91-200 91 199,900 80 96 112 128 161 209 258 451 645 28
GNU100-200(A) 100 199,900 86 102 118 135 167 215 264 458 652 31
GNU72-250(A) 72 250,000 71 91 111 131 172 232 293 535 778 18
GNU100-250(A) 100 250,000 90 110 131 151 191 252 312 555 797 25
GNU100-270(A) 100 270,000 92 114 135 157 201 266 332 594 855 23
GNU65-360(A) 65 360,000 75 104 133 162 220 307 395 744 1093 11
GNU100-400(A) 100 399,900 102 135 167 199 264 361 458 846 1233 15
FIRST TIME DELIVERY (Includes useable storage and recovery for indicated times.)
WATER CONNECTIONS APPROXIMATE
MODEL TOP FRONT REAR
SHIPPING WEIGHT
NUMBER
A B C D E F G H
IN/OUT SIDE SIDE STD. ASME
GNU75-125 65-1/2 61 26-1/4 25 5 56 3/4 20 1-1/2 1-1/2 1-1/2 480 lbs. N/A
GNU82-156 68-13/16 64 26-1/4 25 6 58-5/8 3/4 20 1-1/2 1-1/2 1-1/2 490 lbs. N/A
GNU37-200 49-1/4 43-3/8 26-1/4 25 6 37-5/8 3/4 20 1-1/2 1-1/2 1-1/2 405 lbs. N/A
GNU76-200 68-13/16 64 26-1/4 25 6 58-5/8 3/4 20 1-1/2 1-1/2 1-1/2 540 lbs. N/A
GNU91-200 76-5/16 71-13/16 26-1/4 30-5/8 6 66-3/8 3/4 20 1-1/2 1-1/2 1-1/2 600 lbs. N/A
GNU100-200(A) 73-1/16 66-1/8 30-1/4 23-1/4 6 57-1/2 3/4 23 1-1/2 2 2 780 lbs. 835 lbs.
GNU72-250(A) 71-1/16 64-1/2 26-1/4 25 6 58-5/8 3/4 20 1-1/2 1-1/2 1-1/2 590 lbs. 630 lbs.
GNU100-250(A) 73-1/4 66-1/8 30-1/4 23-1/4 6 57-1/2 3/4 23 1-1/2 2 2 795 lbs. 835 lbs.
GNU100-270(A) 73-7/8 66-1/8 30-1/4 23-1/4 6 57-1/2 3/4 23 1-1/2 2 2 805 lbs. 845 lbs.
GNU65-360(A) 70-11/16 64-1/2 26-1/4 25 8 58-5/8 3/4 N/A N/A 1-1/2 1-1/2 640 lbs. 680 lbs.
GNU100-400(A) 76 68-1/2 30-1/4 32-1/4 8 61-3/4 1 23 1-1/2 2 2 770 lbs. 810 lbs.
DIMENSIONS
(Inches)
All Models Require a 120V / 1.5 Amp Power Source. (A) Suffix Indicates ASME Tank Construction Available.
Recovery ratings are based on thermal efficiencies obtained in a CSA certified laboratory.
(A) indicates available ASME model.
CLEARANCE TO
COMBUSTIBLES
(inches)
MODEL
NUMBER SIDE REAR TOP
GNU75-125 2 2 12
GNU82-156 2 2 12
GNU37-200 2 2 12
GNU76-200 2 2 12
GNU91-200 2 2 12
GNU100-200(A) 2 4 12
GNU72-250(A) 6 6 12
GNU100-250(A) 2 4 12
GNU100-270(A) 2 4 12
GNU65-360(A) 6 6 12
GNU100-400(A) 6 6 12
C
H
E
ABF
D
OUTLET
TOP
INLET
TOP
OUTLET
FRONT SIDE
OUTLET
REAR SIDE
SYSTEM
SENTINEL
T&P
INLET
FRONT SIDE
INLET
REAR SIDE
G
7"
(178mm)
9.773
Recommended Specifications (for trade reference only)
Water heater(s) shall be Universal ultra low NOx model ____________, manufactured by Rheem, having gas input of
__________ Btu/h and a recovery rate of _____________ GPH at a 100°F temperature rise when tested and certified at
____________ thermal efficiency. Water heater(s) shall have a storage capacity of _________ gallons. Water heater(s) shall
have the CSA seal of certification and supplied with a factory installed CSA/ASME rated temperature and pressure relief
valve. Tank(s) shall be furnished with a tube bundle having a double coating of high temperature porcelain enamel and
furnished with magnesium anode rods rigidly supported. Water heater(s) shall meet or exceed the thermal efficiency and
standby loss requirements of ASHRAE Standard 90.1b-2001. Tanks shall have a working pressure rating of 150 psi, and
shall be completely factory assembled, including a pressure regulator properly adjusted for operation on ___________ gas
with stainless steel burners. Controls will be arranged for safety shutoff in event of pilot failure. Water heater(s) with inputs
less than 360,000 Btu/h shall have top, front and rear side inlet/outlet water connections. Water heater(s) shall be covered
by a three year limited warranty against tank leaks.
When ordering ASME construction, place (A) after the model number (for trade reference only)
Water heater(s) shall be constructed in accordance with the requirements of the ASME Boiler and Pressure Vessel Code,
Section IV Part HLW.
Rheem Water Heating • 1115 Northmeadow Parkway, Suite 100
Roswell, Georgia 30076 • www.rheem.com
Rheem Canada Ltd./Ltée • 125 Edgeware Road, Unit 1
Brampton, Ontario L6Y 0P5 • www.rheem.com