Ruud PROG40S-34N RH62 *

This site calculates the 188 therms figure; the registry does not publish it. The calculation uses the registry's UEF, the ratio of hot water delivered to energy used. It also uses the DOE test's daily hot-water draw for the medium draw pattern. This model's UEF is 0.59, taken from the DOE CCD and retrieved on 2026-09-19. Its class is the 288 models registered as a gas tank at the medium draw pattern. Within that class, it ranks 186th lowest in energy use. That rank puts it in the second-highest quarter of its class for energy use. At the test draw, it sits 3 therms a year above the class median. You can see each step behind the annual figure in how the annual energy and cost are calculated.

The 188 therms figure applies only to the medium draw pattern. DOE uses this pattern to stand for a typical household on a busy morning. The unit's first hour rating, the gallons of hot water available in the first hour from a full tank, is 65 gallons. Its rated volume is 38 gallons. A plumber checking a like-for-like swap can compare these two values with the old unit's registry entry. A household that uses much more or much less hot water than the medium pattern will not use 188 therms a year. This page has no energy figure for other draw patterns. Models ranked ahead of 186th in this class use less gas at the test draw. To list other gas tank models in the same class, use find a same-class replacement by model number.

This text gives no running cost because the cost depends on your state's average residential gas price. The cost block works it out from your ZIP by applying that price to 188 therms a year at the medium draw pattern. The 3 therms gap to the class median is costed at the same rate, so its cost depends on where you live. The installed-price range appears in its own block, with its own source and date. It is a modeled range, not a quote. To try a different ZIP, use the water heater cost calculator for your ZIP. This page cannot show your actual bill. Your household's use and your rate plan may differ from the test assumptions.