Envirosense Reliance Home Comfort GPCX-50L 1**

The yearly figure of 188 therms of natural gas applies to the high draw pattern only. This site computed it, not the registry, from the registry's UEF, the ratio of hot water delivered to energy used, of 0.9 and the DOE test's daily hot-water draw for that pattern. The source is DOE CCD, retrieved 2026-09-19. The class median for the 414 models registered as a gas tank at the high draw pattern is 260 therms. This model sits 72 therms below that median. It ranks 1st lowest energy use of 414, which places it in the lowest quarter of its class. The comparison covers energy use only and does not address purchase price.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The 188 therms figure suits readers verifying a unit for that kind of use. The first hour rating, the gallons of hot water available in the first hour from a full tank, is 118 gallons, and the rated volume is 49 gallons. Compare the first hour rating with your own busiest hour. This page does not judge whether it covers your household. The figure does not suit readers whose use follows another draw pattern, because energy use for other patterns is not available here. The selector by fuel, space and size narrows models on those terms.

Running cost is not in the text because it depends on your state's average residential gas price. Multiplying 188 therms by your own rate gives the yearly gas cost at the federal test's draw, and your actual use may differ from that draw. The cost calculator on your own ZIP does this for you, and how the annual cost is calculated sets out the method. The installed price range is not published for this model, because its ratings lie outside the range the cost database's model was fitted on, and the range is not stretched past it. To compare against a same-class unit, find a same-class replacement by model number.