Rheem Commercial Universal Ultra-Low NOx (ULN) Natural 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. Top， Front and Rear water inlets/outlets offer installation flexibility giving this water heater the name: Universal. Please Note: This model requires a 120-Volt power source.

California and 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: our exclusive diagnostic system， with glowing LED lights， verifies system operation sequence by sequence

Strong tank design: universals proprietary steel formulation， patented multi-flue design， combined with 2-coats of porcelain enamel， results in a superior heat exchanger design

Stainless steel burners: precision burners， raised port design are formed from high chromium stainless steel; each burner assembly slides out like a drawer for quick inspection and maintenance

Low profile automatic flue damper: low profile 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 and hand-hole cleanout for easy removal of lime/sediment deposits

Direct spark to pilot ignition system: saves energy by igniting only when there is a call for heat

Built-in corrosion resistance: patented anode design utilizes multiple magnesium rods to ensure corrosion resistance for a long tank life

Fully insulated: energy saving sag and moisture proof fiberglass insulation surrounds the storage tank and heavy mineral wool insulation surrounds the combustion chamber

Insulation: sag and moisture proof fiberglass insulation surrounds the storage tank and heavy mineral wool insulation surrounds the combustion chamber

Gas control system: thermostat adjusts from 100 degree F to 180 degree F， 24-Volt combination gas valve includes main gas pressure regulation， on-off manual valve， 120-Volt/24-Volt transformer and high limit temperature cut-out

Call 1-855-400-2552 before noon for same-day installation service in most areas， or