Rheem PROG50S-40U RH60 EC1*

This site calculated the 269 therms figure. The registry did not. The calculation uses 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 draw pattern. The registry lists a UEF of 0.63 for this model. The input comes from DOE's Compliance Certification Database (CCD), retrieved 2026-09-19. The figure is valid only at that test draw. A household that uses less hot water than the test assumes would likely use less gas, and one that uses more would likely use more. This page does not know how much hot water your household actually uses. Use 269 therms to compare models under a fixed condition. The steps are set out on the page that explains how the annual energy and cost figures are calculated.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The registry gives this model a first hour rating, the gallons of hot water available in the first hour from a full tank, of 85 gallons. Its rated volume is 48 gallons. Among the 414 gas tank models at the high draw pattern, it ranks 320th lowest in energy use. That puts it in the highest quarter of its class for energy use. If you need a model at or below the 260 therms median, you can compare other models in the same class with the same-class replacement search by model number. The registry data used here does not cover durability, noise or service history. Those points are not available on this page.

The text gives no running cost for this model because the cost depends on your state's average residential gas price. Instead, the page calculates it from your ZIP, based on 269 therms a year at the high draw pattern. So readers in different states will see different costs for the same unit. The 9 therms difference from the class median also costs a different amount at each local rate. This text does not convert that difference into money. You can run the same calculation for other models in the water heater cost calculator for your ZIP. The installed-price range appears in a separate block with its own source and date. That range is a modeled installed cost, not a quote, and this text does not repeat its figures.