Rheem PROPH40 T0 RH120

The 1,254 kWh figure is calculated by this site, not published in the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw. This model's UEF of 2.59 comes from the DOE Compliance Certification Database, retrieved 2026-09-19. The figure applies only at the medium draw pattern, which describes a typical household's hot-water use on a busy morning. The 426 models in its class are all compared at this same medium draw pattern. A home that draws more or less hot water than the test assumes will use a different amount than 1,254 kWh a year.

The tank's rated volume is 37 gallons. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 43 gallons. The figures fit a household whose busiest hour of hot-water use stays within 43 gallons. A household that regularly needs more than 43 gallons in its busiest hour is outside what this rating covers. Its 129th place puts it in the second-lowest quarter of its class; models in the lowest quarter use less energy. To compare it with other medium-draw electric tanks, find a same-class replacement by model number, or filter models by fuel, space and size.

This page does not state a running cost, because the cost of 1,254 kWh a year depends on your own utility's electricity tariff. Instead, the page computes it from your ZIP code; the cost calculator for your own ZIP shows the result. How the annual cost is calculated describes the steps between the energy figure and that cost. An installed price range is not published for this model. Its ratings, including the UEF of 2.59, lie outside the range the cost database's model was fitted on. The site does not stretch that range to cover it. Energy use at other draw patterns is not available on this page.