JOHN WOOD GPVT-40 2**

The registry does not print the 242 therms figure. This site computed it from the model's UEF, the ratio of hot water delivered to energy used, and the DOE test's daily hot-water draw for the high draw pattern. The registry lists a UEF of 0.7 for this model in the DOE CCD, retrieved on 2026-09-19. The figure holds only at that test draw. A household that uses more hot water than the test assumes will use more gas, and one that uses less will use less. The registry does not say how much more or less. The steps behind this calculation are set out on how the annual energy and cost figures are calculated.

This model ranks 90th lowest for energy use among the 414 gas tank models registered at the high draw pattern. That places it in the lowest quarter of its class for energy use. The high draw pattern describes a larger household, or one where showers and laundry overlap. For that kind of use, the registry lists a first hour rating, the gallons of hot water available in the first hour from a full tank, of 87 gallons. The rated volume is 38 gallons. Someone verifying a replacement can check these values against the unit being removed. They can also find a same-class replacement by model number.

The 242 therms figure applies only to a household whose use matches the high draw pattern. The registry gives no figure for this model at other draws, so that value is not available. The registry also states no running cost. That cost depends on the average residential gas price in your state. The page therefore computes it from your ZIP instead of stating it here. The cost value of the 18 therms gap to the class median also depends on that gas price. To see the cost at your own rate, use the cost calculator for your ZIP. The installed-cost range on this page is a modeled range with its own source and date. It is not a quote.