RELIANCE WATER HEATERS GDV-50 3**

This site computed the 256 therms figure; the registry does not publish it. The calculation starts from the registry's UEF, the ratio of hot water delivered to energy used. For this model the UEF is 0.66. It is applied to the DOE test's daily hot-water draw for the high pattern. The inputs come from the DOE CCD, retrieved 2026-09-19. Among the 414 gas tank models at the high pattern, this model ranks 192nd for lowest energy use. That puts it in the second-lowest quarter of its class, below the median given above. If your household uses more or less hot water than the test assumes, your use will differ from 256 therms. This page does not know by how much. The steps are set out in how the annual cost is calculated.

The high draw pattern describes a larger household, or one where showers and laundry overlap. This model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 77 gallons. Its rated volume is 48 gallons. The 256 therms figure applies to a home whose hot-water use fits that pattern. A home that needs more than 77 gallons in its busiest hour needs more than this rating covers. A smaller household with lighter use is not tested at this pattern, so the figure does not describe its use. To match a unit, you can find a same-class replacement by model number. To compare by fuel or size, use the selector by fuel, space and size.

This text gives no running cost for the GDV-50 3**. The cost of 256 therms of natural gas a year differs from state to state. The page prices it at your state's average residential gas rate, so it calculates the cost from your ZIP. You can also run the numbers in the cost calculator on your own ZIP. The 4 therms gap to the class median is a difference in energy use. What it costs at your rate appears only after that calculation. The installed-cost block on this page is a modeled range with its own source and date, not a quote. Your actual hot-water use and future gas prices are not available here.