LOCHINVAR GCR-30 2**

This site computes the 176 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 DOE test's daily hot-water draw for the medium pattern. This unit's UEF is 0.63. The inputs come from the DOE Compliance Certification Database, retrieved 2026-09-19. At the medium pattern, the model ranks 62nd lowest in energy use of the 288 models in its class. The figure applies only to that test draw. A household drawing more or less hot water than the test assumes will use a different amount of gas, and this page does not estimate that amount. The steps are set out in how the annual cost is calculated.

Its first hour rating, the gallons of hot water available in the first hour from a full tank, is 63 gallons. Its rated volume is 29 gallons. These two figures, not the energy figure, show how much hot water the tank can supply at once. The medium pattern stands for a typical household's usage on a busy morning. A home that needs more than 63 gallons in its peak hour needs more than this rating covers. This page has no data on how the tank performs after that first hour. To compare tanks by fuel, space and size, use the water heater selector. To match this unit within the same gas tank, medium-pattern class, search for a same-class replacement by model number.

Running cost is not stated in this text. It depends on your state's average residential natural gas price, applied to the 176 therms used at the medium pattern. The page computes that cost from your ZIP code, and the cost calculator for your own ZIP shows it. At the same pattern, this model uses 9 therms less gas a year than the 185 therms class median. At any given gas price, its running cost is therefore lower than that of a model at the median. No installed price range is published for this model. Its ratings fall outside the range the cost database's model was fitted on, and the range is not extended past it.