RELIANCE WATER HEATERS GPVL-40 2**

The registry lists RELIANCE WATER HEATERS model GPVL-40 2** with a UEF, the ratio of hot water delivered to energy used, of 0.67. This site, not the registry, computed the annual figure of 165 therms by combining that UEF with the daily hot-water draw of the medium draw pattern. The figure therefore holds only for that draw and for natural gas. The source is DOE CCD, retrieved 2026-09-19. Among the 288 models registered as a gas tank at the medium draw pattern, the class median is 185 therms. This model sits 20 therms below that median, which places it in the lowest quarter of its class for energy use, at 20th lowest.

The first hour rating, the gallons of hot water available in the first hour from a full tank, is 73 gallons for this model, and the rated volume is 38 gallons. The medium draw pattern represents a typical household on a busy morning, so the 165 therms figure describes a household with that kind of use. A household whose peak demand is close to that pattern can compare its own morning use with the 73 gallon rating. A household with a heavier or lighter draw is outside what this figure describes. The registry data used here gives no annual energy for other draw patterns, so it is not available for this model.

The running cost is not stated here because it depends on the state average residential gas price, which differs by reader. The cost calculator applies that price, based on your ZIP, to the 165 therms figure. The steps are set out in how the annual cost is calculated. The modeled installed-cost range appears in its own block on this page with its source and date, and it is not a quote. To look at another unit in the same class, you can find a same-class replacement by model number. The gap of 20 therms from the 185 therms median is measured at the test draw, not at your actual household use.