Richmond PRO+G55-45U RH59 EC1*

This site calculated the 273 therms figure; the registry does not list 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 high draw pattern. For this model the UEF is 0.62, from the DOE CCD as retrieved on 2026-09-19. A household that uses more or less hot water than the test assumes will use a different amount of gas than 273 therms. The page on how the annual energy and cost figures are calculated sets out each step behind this figure.

The high draw pattern stands for 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 99 gallons. Its rated volume is 55 gallons. Among the 414 gas tank models registered at the high draw pattern, it ranks 367th for lowest energy use. That puts it in the quarter of its class with the highest energy use. This page has no energy figures for this model at other draw patterns. To compare it with other units in the same class, use the same-class replacement search by model number.

This text gives no running cost for the 273 therms of natural gas. That cost depends on the average residential gas price in the reader's own state, so the page calculates it from the reader's ZIP. The water heater cost calculator for your ZIP applies that state rate to this model's figure. This text also gives no cost for the gap to the 260 therms class median, because that cost depends on the same state rate. Any cost result holds only at the test's daily draw for the high draw pattern. The installed price range appears in its own block with its source and date. It is a modeled installed-cost range, not a quote, and this text does not restate it.