Rheem RTGH-C95XLN

The registry does not print the 182 therms figure. This site calculated it from two inputs. The first is the registry's UEF, the ratio of hot water delivered to energy used. The second is the daily hot-water draw that the DOE test sets for the high draw pattern. For the Rheem RTGH-C95XLN, the UEF is 0.93, from DOE CCD data retrieved 2026-09-19. The result holds only at the federal test's daily draw. A home that draws a different volume of hot water will use a different amount of gas. Among the 397 models registered as a gas tankless unit at the high draw pattern, this model sits in the second-lowest quarter for energy use. The calculation is set out in the method behind the annual energy and cost figures.

The high draw pattern represents a larger household, or one where showers and laundry overlap. The 182 therms figure was calculated for that level of use, so it describes homes of that kind most closely. The registry lists this unit's maximum flow rate in gallons per minute as 5.6. For a home with lighter daily use, the figure falls outside its test condition. Annual use at a lower draw is not available in the registry or on this page. To compare other units by fuel, space and size, use the water heater selector by fuel, space and size. To match this class by model number, see same-class replacements by model number.

The text of this page does not state a running cost. The cost of 182 therms of natural gas depends on your state's average residential gas price, so the page calculates it from your ZIP. As noted above, this model's use is 0 therms from the class median. At any given gas rate, its running cost therefore matches that of a median model in its class. Its rank of 183rd lowest of 397 does not change with price, because every model in the class uses the same fuel. The installed-cost range appears in its own block, as a modeled range rather than a quote. To see the cost at your own rate, use the running cost calculator for your ZIP.