Rheem PROE40 T2 RH CG

The 3,531 kWh figure is computed by this site, not published by the registry. It uses the registry's UEF, the ratio of hot water delivered to energy used, which is 0.92 for this model. That UEF is applied to the DOE test's daily hot-water draw for the medium draw pattern. The registry values come from the DOE CCD, retrieved 2026-09-19. Energy use at other daily draws is not available in this data. Among the 426 models registered as an electric tank at the medium draw pattern, this unit ranks 213th for lowest energy use. That places it in the second-lowest quarter of its class. The steps behind these numbers are set out in how the annual cost is calculated.

This unit has a first hour rating, the gallons of hot water available in the first hour from a full tank, of 55 gallons. Its rated volume is 36 gallons. The medium draw pattern stands for a typical mid-sized household on a busy morning. A home whose daily use is close to that pattern is the case the 3,531 kWh figure describes. A household that needs more than 55 gallons in its busiest hour would exceed this rating. A home that uses much more or much less hot water each day would see a different yearly figure, and that figure is not available here. To compare other units, use the water heater selector by fuel, space and size.

This page does not state a running cost in the text. What 3,531 kWh of electricity costs depends on your own utility tariff, and that tariff is not in the registry data. The page computes it from your ZIP code instead, using the running cost calculator for your own ZIP. The installed price appears in its own block, with its source and date, as a modeled range rather than a quote. For a plumber or seller checking a like-for-like swap, the class rank given above is the reference point. Other units in the same electric tank, medium draw pattern class can be found with the same-class replacement search by model number.