Rheem XG50T06EC38U1 *

This site calculated the 269 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 pattern. This model's UEF is 0.63, from the DOE CCD, retrieved 2026-09-19. Among the 414 gas tank models at the high draw pattern, it ranks 320th for lowest energy use. That places it in the highest quarter of its class for energy use. The 9 therms gap to the class median holds at the federal test's draw only. The page explains how the annual energy and cost are calculated.

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 85 gallons. Its rated volume is 48 gallons. The 269 therms figure describes a home whose daily hot-water use is close to the test's draw. For a home that uses much less or much more hot water, this page has no energy figure. To check other units by fuel, space and size, see the water heater selector. To match this unit within its own class, use same-class replacement by model number.

The text on this page does not state a running cost. The cost of 269 therms of natural gas depends on your state's average residential gas price. For that reason, the page calculates it from your ZIP instead of giving one national figure. Enter your ZIP in the water heater cost calculator to see the yearly cost at your rate. The 9 therms gap to the class median is priced at that same rate. The installed-cost range on this page appears in its own block, with its source and date. That range comes from a cost model; it is not a quote for this unit.