RELIANCE WATER HEATERS GUR 40 4**

This site computes the 264 therms figure; the registry does not publish it. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the daily hot-water draw the DOE test sets for the high draw pattern. For this model the UEF is 0.64. The figure therefore holds only at that test draw. A home that draws more hot water each day would use more gas than 264 therms, and a home that draws less would use less. The registry data behind it comes from the DOE CCD, retrieved 2026-09-19. The full calculation steps are set out in how the annual energy and cost figures are calculated.

The high draw pattern describes a larger household, or one where showers and laundry overlap. This unit's first hour rating, the gallons of hot water available in the first hour from a full tank, is 83 gallons, from a rated volume of 38 gallons. Those two figures and the draw pattern show the kind of demand the unit was tested against. A household with lighter daily use is not the case the 264 therms figure describes. Its annual gas use at a lighter draw is not available here. Whether the unit fits a given home depends on that home's peak hot-water use, which the registry does not record. To compare other units, use the water heater selector by fuel, space and size.

The class here is the 414 models registered as a gas tank at the high draw pattern. The 4 therms gap above the median, noted at the top of the page, places this unit in the second-highest quarter of its class for energy use. The running cost is not stated in this text. It depends on the reader's state average residential gas price, so the page computes it from the reader's ZIP, using 264 therms as the input. You can run the same figure in the cost calculator for your own ZIP. The modeled installed-cost range appears in its own block, with its source and date, and it is not a quote. To look up units in the same class, use the same-class replacement finder by model number.