Rheem RHE50

This site calculates the 212 therms figure; the registry does not publish it. The calculation uses the model's UEF, the ratio of hot water delivered to energy used. It also uses the DOE test's daily hot-water draw for the high draw pattern. The registry lists a UEF of 0.8 for the RHE50, taken from the DOE CCD on 2026-09-19. The figure holds only at the federal test's daily draw. A home that uses more or less hot water will use a different amount of gas. Among the 414 models in its class, it ranks 29th lowest for energy use. That places it in the lowest quarter of its class. The steps behind the estimate are set out in how the annual cost is calculated.

The RHE50 is rated at the high draw pattern. That pattern stands for a larger household, or one where showers and laundry overlap. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 87 gallons. It has a rated volume of 46 gallons. These ratings describe a home whose use is close to that pattern. For a smaller household with lighter use, this page has no energy figure. The rank of 29th also compares only gas tank models at the high draw pattern. Heat pump and tankless units are not part of that group. To look at other fuels or sizes, use the selector by fuel, space and size.

This page does not state the running cost because it depends on your state's average residential gas price. The page takes that price from your ZIP and applies it to 212 therms of natural gas a year. At any single gas price, the 48 therms gap to the class median carries over to cost in the same proportion. An installed price range is not available for the RHE50. Its ratings lie outside the range the cost database's model was fitted on. The site does not extend that range past those limits. You can apply your own rate in the cost calculator on your ZIP. You can also find a same-class replacement by model number.