Ruud RTGH-C95XLN

The registry does not list the 182 therms figure. This site calculated it from the model's UEF, the ratio of hot water delivered to energy used. For this Ruud model the registry's UEF is 0.93. The calculation combines that ratio with the daily hot-water draw that DOE's test sets for the high draw pattern. The source is DOE's Compliance Certification Database (CCD), retrieved on 2026-09-19. The result holds only at that test draw. A home that draws a different amount of hot water each day will use a different amount of gas. The registry does not give this unit's gas use in any specific home. The steps behind the conversion are set out in how the annual energy and cost figures are calculated.

The high draw pattern represents a larger household, or one where showers and laundry overlap. The registry lists this unit's maximum flow rate in gallons per minute as 5.6. It is compared with the 397 models registered as a gas tankless unit at the high draw pattern. Within that group it ranks 183rd lowest for energy use, in the second-lowest quarter of its class. Its 182 therms sits 0 therms from the class median of 182 therms. It therefore matches the class median rather than falling below it. To check other models against this same class median, use the tool to find a same-class replacement by model number.

The 182 therms figure does not describe a household whose daily hot-water use differs from the high draw pattern. This page does not have gas use figures for that household. The class median of 182 therms also covers gas tankless units at the high draw pattern only. Tank and electric models fall outside that comparison. The running cost is left out of this text because it depends on your state's average residential gas price. The page calculates it from your ZIP instead. The water heater cost calculator for your ZIP applies your own rate to 182 therms. The modeled installed-cost range is shown in its own block with its source and date. It is not a quote.