Rheem PROG40-36P RH67 PV

This site computed the 163 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 hot-water draw for this pattern. This model's UEF is 0.68, and its rated volume is 38 gallons. The source is the DOE Compliance Certification Database, retrieved 2026-09-19. The figure holds only at the federal test's daily draw, so a home using more or less hot water will burn a different amount of gas. The registry does not show how large that difference would be. The comparison class is the 288 models registered as a gas tank at the medium draw pattern. Each step is set out in how the annual cost is calculated.

This unit fits homes whose hot-water use resembles the medium draw pattern, which DOE uses to represent a typical household. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 71 gallons. At that pattern, its 163 therms places it in the lowest quarter of its class for energy use. It suits a reader who wants a gas tank near 38 gallons with energy use below its class median. It does not suit a household that regularly needs more than 71 gallons in its busiest hour. The registry data does not cover performance above that rating. Other sizes and fuels can be compared with the selector by fuel, space and size.

The running cost is not stated in this text, because it depends on your state's average residential gas price. The page computes it from your ZIP, using the 163 therms figure at the medium draw pattern. The 22 therms gap below the class median is the same for every reader, but its cost changes with the local gas rate. A home that uses more hot water than the federal test assumes will also see a different cost, and that amount is not known here. To see the figure at your own rate, use the cost calculator on your own ZIP. To check another model in the same class, find a same-class replacement by model number.