| Items |
 GNU37-200 Universal™ Ultra-Low NOx Commercial Gas Water Heaters |
GNU65-360(A) Universal™ Ultra-Low NOx Commercial Gas Water Heaters |
GNU72-250(A) Universal™ Ultra-Low NOx Commercial Gas Water Heaters |
GNU75-125 Universal™ Ultra-Low NOx Commercial Gas Water Heaters |
GNU76-200 Universal™ Ultra-Low NOx Commercial Gas Water Heaters |
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| Description | Universal™ ultra low NOx is a family of commercial gas water heaters that are designed to fit into tight retrofit applications. | |||||||||
| Manufacturer | Rheem® | |||||||||
| Tank Capacity | 35 gal | 65 gal | 72 gal | 75 gal | 76 gal | |||||
| Input Power | 199900 BTU/hr | 360000 BTU/hr | 250000 BTU/hr | 125000 BTU/hr | 199900 BTU/hr | |||||
| Thermal Efficiency | 82 % | 80 % | 80 % | 80 % | 80 % | |||||
| Recovery at 40 ºF Temperature Rise | 485 gal/h | 873 gal/h | 606 gal/h | 303 gal/h | 485 gal/h | |||||
| Recovery at 50 ºF Temperature Rise | 388 gal/h | 698 gal/h | 485 gal/h | 242 gal/h | 388 gal/h | |||||
| Recovery at 60 ºF Temperature Rise | 323 gal/h | 582 gal/h | 404 gal/h | 202 gal/h | 323 gal/h | |||||
| Recovery at 70 ºF Temperature Rise | 277 gal/h | 499 gal/h | 346 gal/h | 173 gal/h | 277 gal/h | |||||
| Recovery at 80 ºF Temperature Rise | 242 gal/h | 436 gal/h | 303 gal/h | 152 gal/h | 242 gal/h | |||||
| Recovery at 90 ºF Temperature Rise | 215 gal/h | 388 gal/h | 269 gal/h | 135 gal/h | 215 gal/h | |||||
| Recovery at 100 ºF Temperature Rise | 194 gal/h | 349 gal/h | 242 gal/h | 121 gal/h | 194 gal/h | |||||
| Recovery at 110 ºF Temperature Rise | 176 gal/h | 317 gal/h | 220 gal/h | 110 gal/h | 176 gal/h | |||||
| Recovery at 120 ºF Temperature Rise | 162 gal/h | 291 gal/h | 202 gal/h | 101 gal/h | 162 gal/h | |||||
| Recovery at 130 ºF Temperature Rise | 149 gal/h | 269 gal/h | 186 gal/h | 93 gal/h | 149 gal/h | |||||
| Recovery at 140 ºF Temperature Rise | 138 gal/h | 249 gal/h | 173 gal/h | 87 gal/h | 138 gal/h | |||||
| First Time Delivery at 100 ºF (5 Minutes) | 41 gal | 75 gal | 71 gal | 63 gal | 69 gal | |||||
| First Time Delivery at 100 ºF (10 Minutes) | 56 gal | 104 gal | 91 gal | 73 gal | 86 gal | |||||
| First Time Delivery at 100 ºF (15 Minutes) | 72 gal | 133 gal | 111 gal | 83 gal | 102 gal | |||||
| First Time Delivery at 100 ºF (20 Minutes) | 88 gal | 162 gal | 131 gal | 93 gal | 118 gal | |||||
| First Time Delivery at 100 ºF (30 Minutes) | 119 gal | 220 gal | 172 gal | 113 gal | 150 gal | |||||
| First Time Delivery at 100 ºF (45 Minutes) | 167 gal | 307 gal | 232 gal | 143 gal | 199 gal | |||||
| First Time Delivery at 100 ºF (60 Minutes) | 214 gal | 395 gal | 293 gal | 174 gal | 247 gal | |||||
| First Time Delivery at 100 ºF (120 Minutes) | 403 gal | 744 gal | 535 gal | 295 gal | 441 gal | |||||
| First Time Delivery at 100 ºF (180 Minutes) | 562 gal | 1093 gal | 778 gal | 416 gal | 635 gal | |||||
| Minimum to Recovery Contents | 11 | 11 | 18 | 37 | 24 | |||||
| Schematic |
 Schematic Drawing for Universal™ Ultra-Low NOx is a Family of Commercial Gas Water Heaters |
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| Dimension A | 49-1/4 in | 70-11/16 in | 71-1/16 in | 65-1/2 in | 68-13/16 in | |||||
| Dimension B | 43-3/8 in | 64-1/2 in | 64-1/2 in | 61 in | 64 in | |||||
| Dimension C | 26-1/4 in | |||||||||
| Dimension D | 25 in | |||||||||
| Dimension E | 6 in | 8 in | 6 in | 5 in | 6 in | |||||
| Dimension F | 37-5/8 in | 58-5/8 in | 58-5/8 in | 56 in | 58-5/8 in | |||||
| Dimension G | 3/4 in | |||||||||
| Dimension H | 20 in | 20 in | 20 in | 20 in | ||||||
| Top Inlet/Outlet Water Connection | 1-1/2 in | 1-1/2 in | 1-1/2 in | 1-1/2 in | ||||||
| Front Side Water Connection | 1-1/2 in | |||||||||
| Rear Side Water Connection | 1-1/2 in | |||||||||
| Standard Approximate Shipping Weight | 405 lb | 640 lb | 590 lb | 480 lb | 540 lb | |||||
| ASME Approximate Shipping Weight | 680 lb | 630 lb | ||||||||
| Side Clearance to Combustibles | 2 in | 6 in | 6 in | 2 in | 2 in | |||||
| Rear Clearance to Combustibles | 2 in | 6 in | 6 in | 2 in | 2 in | |||||
| Top Clearance to Combustibles | 12 in | |||||||||
| Voltage | 120 V | |||||||||
| Current | 1.5 A | |||||||||
| Working Pressure | 150 psi | 160 psi | 160 psi | 150 psi | 150 psi | |||||
| Style | Universal™ Ultra-Low NOx | |||||||||
| Size | C | |||||||||
| Type | Natural Gas | |||||||||
| Industry Standards | ANSI Z-21.10.3 - CSA 4.3 ASHRAE Standards 90.1b-2001 CSA® Certified | ANSI Z-21.10.3 - CSA 4.3 ASHRAE Standards 90.1b-2001 ASME Certified CSA® Certified | ANSI Z-21.10.3 - CSA 4.3 ASHRAE Standards 90.1b-2001 ASME Certified CSA® Certified | ANSI Z-21.10.3 - CSA 4.3 ASHRAE Standards 90.1b-2001 CSA® Certified | ANSI Z-21.10.3 - CSA 4.3 ASHRAE Standards 90.1b-2001 CSA® Certified | |||||
| Features and Benefits |
The tighter the commercial retrofit, the more you will appreciate how the Universal™'s compact size and multiple water connections simplify ultra low NOx installations. Choose from 80% thermal efficiency models that range from 125,000-399,900 Btu/h and 82% thermal efficiency models that range from 199,900 - 270,000 Btu/h. All models have a maximum temperature setting of 180 ºF. Space Saver Design The short heights and narrow jacket diameters, plus the top, front and rear water inlets/outlets offer the ultimate in installation flexibility. System Sentinel™ LED Diagnostic System Our exclusive diagnostic system, with glowing LED lights, verifies system operation sequence by sequence. Patented Technology Universal’s proprietary steel formulation, patented multi-flue design, combined with two coats of porcelain enamel, results in a superior heat exchanger design. Ultra Low NOx Burner The power assist burner design incorporates stainless steel multi-port burner tubes for long term low NOx performance, less than 14 ng/J. A sight glass allows for burner observation. The entire design is removable and it is highly resistant to the effects of negative air pressure common in modern commercial buildings. Base Rail Design Provides for better handeling when moving and positioning unit. Low Profile Automatic Flue Damper Low profile damper minimizes overall product height. Heavy duty vent hood supports are designed to withstand the rigors of installation. Full-port, Full-flow Drain Valve Factory installed brass drain valve allows for faster draining and servicing. Direct Spark-to-Pilot Ignition System Energy saving ignition that ignites pilot only when there is a call for heat. Patented Anode Rods Anode design utilizes multiple magnesium rods to ensure corrosion resistance for a long tank life. |
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| General Information |
Efficiency All models tested according to ANSI test procedures, and meet or exceed the thermal efficiency and standby loss requirements of ASHRAE standard (EPact). Also exceeds energy efficiency codes of all states including California Energy Commission (CEC). Safety and Construction Design certified by CSA: For operation at 180 degrees; meets all safety and construction requirement of ANSI Z-21.10.3; as an automatic storage or instantaneous water heater; as an automatic circulating tank water heater; and for operation on combustible floors and in alcove installations. Certified for 150 PSI maximum working pressure. |
Efficiency All models tested according to ANSI test procedures, and meet or exceed the thermal efficiency and standby loss requirements of ASHRAE standard (EPact). Also exceeds energy efficiency codes of all states including California Energy Commission (CEC). Safety and Construction Design certified by CSA: For operation at 180 degrees; meets all safety and construction requirement of ANSI Z21.10.3; as an automatic storage or instantaneous water heater; as an automatic circulating tank water heater; and for operation on combustible floors and in alcove installations. Certified for 160 PSI maximum working pressure. Optional Construction ASME construction is available on designated models. |
Efficiency All models tested according to ANSI test procedures, and meet or exceed the thermal efficiency and standby loss requirements of ASHRAE standard (EPact). Also exceeds energy efficiency codes of all states including California Energy Commission (CEC). Safety and Construction Design certified by CSA: For operation at 180 degrees; meets all safety and construction requirement of ANSI Z21.10.3; as an automatic storage or instantaneous water heater; as an automatic circulating tank water heater; and for operation on combustible floors and in alcove installations. Certified for 160 PSI maximum working pressure. Optional Construction ASME construction is available on designated models. |
Efficiency All models tested according to ANSI test procedures, and meet or exceed the thermal efficiency and standby loss requirements of ASHRAE standard (EPact). Also exceeds energy efficiency codes of all states including California Energy Commission (CEC). Safety and Construction Design certified by CSA: For operation at 180 degrees; meets all safety and construction requirement of ANSI Z-21.10.3; as an automatic storage or instantaneous water heater; as an automatic circulating tank water heater; and for operation on combustible floors and in alcove installations. Certified for 150 PSI maximum working pressure. |
Efficiency All models tested according to ANSI test procedures, and meet or exceed the thermal efficiency and standby loss requirements of ASHRAE standard (EPact). Also exceeds energy efficiency codes of all states including California Energy Commission (CEC). Safety and Construction Design certified by CSA: For operation at 180 degrees; meets all safety and construction requirement of ANSI Z-21.10.3; as an automatic storage or instantaneous water heater; as an automatic circulating tank water heater; and for operation on combustible floors and in alcove installations. Certified for 150 PSI maximum working pressure. |
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| Testing and Certifications |
Altitude Certifications Universal ultra low NOx is certified up to 2,000 feet. High altitude certification for model GNU100-200(A) is 5,200 feet |
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| Warranty |
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| Note |
Recovery ratings are based on thermal efficiencies obtained in a CSA certified laboratory. Water heater(s) shall be constructed in accordance with the requirements of the ASME Boiler and Pressure Vessel Code, Section IV Part HLW. Top-Front-Rear Inlet/Outlet Water Connections. |
Recovery ratings are based on thermal efficiencies obtained in a CSA certified laboratory. (A) indicates available ASME model. Water heater(s) shall be constructed in accordance with the requirements of the ASME Boiler and Pressure Vessel Code, Section IV Part HLW. Top-Front-Rear Inlet/Outlet Water Connections. |
Recovery ratings are based on thermal efficiencies obtained in a CSA certified laboratory. (A) indicates available ASME model. Water heater(s) shall be constructed in accordance with the requirements of the ASME Boiler and Pressure Vessel Code, Section IV Part HLW. Top-Front-Rear Inlet/Outlet Water Connections. |
Recovery ratings are based on thermal efficiencies obtained in a CSA certified laboratory. Water heater(s) shall be constructed in accordance with the requirements of the ASME Boiler and Pressure Vessel Code, Section IV Part HLW. Top-Front-Rear Inlet/Outlet Water Connections. |
Recovery ratings are based on thermal efficiencies obtained in a CSA certified laboratory. Water heater(s) shall be constructed in accordance with the requirements of the ASME Boiler and Pressure Vessel Code, Section IV Part HLW. Top-Front-Rear Inlet/Outlet Water Connections. |
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