Richmond RHE40S

The registry does not print the 204 therms figure. This site calculated it from the registry's UEF, the ratio of hot water delivered to energy used, and the DOE test's daily hot-water draw for the high pattern. The registry lists this model's UEF as 0.83. The source is the DOE CCD, retrieved 2026-09-19. Among the 414 gas tank models at the high draw pattern, this unit ranks 25th lowest in energy use. That puts it in the lowest quarter of its class. The figure holds only at the federal test's daily draw. The data does not give this model's energy use at any other daily draw, so a home that uses more or less hot water cannot read its own use from this figure.

The high draw pattern represents a larger household, or one where showers and laundry overlap. This model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 87 gallons. Its rated volume is 37 gallons. A plumber or seller checking a quote can compare these two ratings with the unit being replaced. A household that uses less hot water each day than the high pattern assumes is not described by the 204 therms figure. To compare models in the same class, use the same-class replacement search by model number. You can also filter models in the water heater selector by fuel, space and size.

This text does not give a running cost. It depends on your state's average residential gas price, so the page calculates it from your ZIP instead of a fixed rate. The annual running cost calculator for your ZIP combines that price with the 204 therms of natural gas covered above. The steps are explained in how the annual water heater cost is calculated. No installed price range is published for the Richmond RHE40S. Its ratings, including the UEF of 0.83, fall outside the range the cost database's model was fitted on. This site does not extend that model past its range, so no installed price for this unit is available here.