RELIANCE WATER HEATERS HETF-55 1**

The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.94 for this model. The registry does not publish annual energy. This site computed 5,278 kWh from that UEF and the DOE test's daily hot-water draw for the high draw pattern. The figure is electricity use under those test conditions, from DOE CCD, retrieved 2026-09-19. It sits 3,972 kWh above the class median of 1,306 kWh, among 194 models registered as an electric tank at the same draw pattern. A home's actual use depends on how much hot water it draws, so the figure describes the federal test and not any particular household.

This model ranks 172nd lowest in energy use of 194, which places it in the highest quarter of its class for energy use. Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 75 gallons, and its rated volume is 55 gallons. The first hour rating is the figure to check for a larger household, where showers and laundry overlap. A household whose priority is low electricity use would find this model 3,972 kWh above the class median. The registry data does not rank the first hour rating within the class, so no capacity comparison is made here. It also does not settle whether the capacity outweighs the energy use for a given household.

The running cost is not stated in this text because it depends on your own utility electricity tariff. To convert 5,278 kWh into a yearly cost, multiply it by your rate per kWh, or use the cost calculator for your ZIP. The method behind the annual cost explains how the figure is calculated. If you want a unit in the same class as this HETF-55 1**, you can find a same-class replacement by model number. The modeled installed-cost range appears in its own block on this page with its source and date, as a range and not a quote, so it is not restated here.