Richmond PROG39S-38U RH62 EC1*

This site calculated the 188 therms figure; the registry does not publish it. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the medium draw pattern. For this model the UEF is 0.59, as listed in the DOE CCD, retrieved 2026-09-19. Among the 288 gas tank models at the medium draw pattern, this one ranks 186th lowest in energy use. Its 3 therms gap above the 185 therms median holds only at the test's daily draw. A household drawing more or less hot water than the test assumes will use a different amount, and the registry gives no figure for that case. You can see how the annual figures are built in the method behind the annual cost calculation.

Size is the second check. The tank has a rated volume of 37 gallons. It also has a first hour rating, the gallons of hot water available in the first hour from a full tank, of 68 gallons. DOE placed it in the medium draw pattern, which models a typical household on a busy morning. A home whose peak-hour demand stays within 68 gallons matches the conditions behind the 188 therms figure. A home with heavier morning use falls outside those conditions. For that home, the 186th rank and the gap from the median do not describe its use. To see other units by the same fuel and size, use the water heater selector by fuel, space and size.

This page does not state the running cost as a figure. The cost depends on your state's average residential gas price. So the page calculates it from your ZIP, using the 188 therms of natural gas at the medium draw pattern. The cost calculator for your own ZIP shows that result. An installed price range for the PROG39S-38U RH62 EC1* is not available. This model's ratings lie outside the range that the cost database's model was fitted on. The site does not extend that range to cover them. To check other units among the same 288 gas tank models, search for a same-class replacement by model number.