STATE GCBL-30R 4**

This site calculated the 185 therms figure. The registry does not publish it. It combines the model's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the medium pattern. The registry lists a UEF of 0.6 for this model in the DOE CCD, retrieved on 2026-09-19. The figure holds only at that test draw. This site has no measured yearly value for a household whose daily hot-water use differs from the medium pattern. Because the figure equals the class median, this model sits at the middle of its class for energy use. It is neither above nor below that middle. The inputs and steps are listed under how this site calculates annual energy and running cost.

The medium draw pattern is the profile DOE uses for a typical mid-size household. The registry gives this model a first hour rating, the gallons of hot water available in the first hour from a full tank, of 65 gallons. Its rated volume is 29 gallons. The model fits a home whose use is close to the medium pattern and whose peak demand stays within 65 gallons in an hour. It fits less well where hot-water use in the busiest hour goes beyond that supply. The registry data here gives no energy figure for that case. As the rank above shows, other gas tank models at the same draw pattern use less gas at the test draw. To list them, find a same-class replacement by model number.

This text does not state a running cost. The cost equals 185 therms priced at the reader's state average residential gas price. The page works out that cost from your ZIP, so the result applies only to the gas price in your state. The same 185 therms costs more a year at a higher gas price and less at a lower one. An installed price range is not published for this model. Its ratings lie outside the range the cost database's model was fitted on, and this site does not extend the range beyond that. To get a figure for your own gas price, use the running cost calculator for your ZIP.