FRIEDRICH PROG50-34U RH EC1

This annual figure is computed by this site, not taken from the registry. It combines the registry's UEF and the DOE test's daily hot-water draw for the high draw pattern, and it gives 269 therms of natural gas a year. The source is DOE CCD, retrieved 2026-09-19. UEF, the ratio of hot water delivered to energy used, is listed at 0.63 for this model. Ranked from lowest to highest energy use, the model is 320th of 414, which places it in the highest quarter of its class for energy use. The gap to the class median of 260 therms is 9 therms, and the direction is above. The calculation is described on the methodology page.

The figure applies only to the high draw pattern, which describes a larger household, or one where showers and laundry overlap. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 80 gallons, and the rated volume is 48 gallons. A household with that usage matches the conditions behind the 269 therms figure. A household that draws less would use a different amount of gas, and this page has no computed figure for other draw patterns. A reader whose priority is low energy use should note that this model sits 9 therms above the class median of 260 therms. The water heater selector filters by fuel, space and size.

The running cost is not stated in the text because it depends on your state's average residential gas price. Multiply 269 therms by that price, or enter your ZIP in the cost calculator, which does the same calculation. The result holds only for the high draw pattern and the federal test's daily draw. Actual use in a home can differ, and this page cannot say by how much. The modeled installed-cost range appears in its own block, with its source and date, and it is not a quote. To compare PROG50-34U RH EC1 with other units in its class of 414 models, you can find a same-class replacement by model number.