Rheem Commercial Universal Heavy Duty 75 Gal. 125K BTU Ultra Low NOx (ULN) Natural Gas Tank Water Heater

Item # 303837295 | Rheem Part # GNU75-125 | UPC Code 020352606187 | UNSPSC Code 40101826 | Catalog Page #521
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Product Overview

Rheem Commercial Universal Gas Water Heaters are designed to fit into tight retrofit applications and have the features and capacity to meet heavy duty demands. The tighter the commercial retrofit, the more you will appreciate how the Universal's compact size and multiple water connections simplify installations. Please Note: This model requires a 120-Volt power source.

  • California & Utah Residents (Utah Effective 7/1/18): this water heater model meets or exceeds Ultra-Low NOx (ULN) emissions requirements for all air quality management districts
  • Texas Residents: this water heater model meets or exceeds Low NOx (LN) emissions requirements for all air quality management districts
  • 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: verifies system operation sequence by sequence
  • Universal's patented multi-flue design with proprietary steel formulation and two coats of porcelain enamel provide strength and reliability in heavy duty applications
  • Stainless steel burners: highly resistant to the effects of negative air pressure common in modern commercial buildings
  • Low profile automatic flue damper: minimizes overall product height and heavy-duty vent hood supports are designed to withstand the rigors of installation
  • Easy to service: factory installed full port, full flow 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
  • Built-in corrosion resistance: patented anode design for a long tank life
  • Warranty: 3-year limited tank warranty
  • Need a different configuration, no problem; our universal line offers water heaters in 35 Gal. to 100 Gal. models available in a range BTU/h in natural gas and liquid propane

Proposition 65 Information

Prop65 Warning Icon WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov


BTU Rating
Certifications and Listings
CSA Listed, UL Classified
Finish Family
Fuel Type
Nominal Tank Capacity (gallons)
Pack Size
Product Depth (in.)
Product Height (in.)
Product Weight (lb.)
Product Width (in.)
Vent Type
Water Heater Gas Type
Natural Gas