VESTA VRS-199

This site computes the 178 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 high pattern. For this model the UEF is 0.95, from DOE CCD data retrieved 2026-09-19. The result therefore applies only at the federal test's daily draw. A home that uses more or less hot water than that test will use a different amount of gas. This data does not show how large that difference would be for a given home. Read the figure as a comparison value under one test condition, not as a forecast of a meter reading.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. The registered maximum flow rate in gallons per minute for this unit is 5.5. Among the 397 gas tankless models at this pattern, it ranks 45th lowest for energy use. That puts it in the lowest quarter of its class. At the test's daily draw, it uses 4 therms a year less than the class median of 182 therms. These figures apply to a household whose use matches the high pattern. For a smaller household they do not, because this data covers the high pattern only. Figures for other draw patterns are not available here. To compare other units in the same class, use the same-class replacement search by model number or the selector by fuel, space and size.

This text states no running cost. The cost depends on your state's average residential gas price, so the page calculates it from your ZIP. Enter your ZIP in the cost calculator for your own ZIP to price the 178 therms a year at your rate. The money value of the 4 therms gap from the class median also depends on that rate. The method behind the annual cost calculation lists the inputs used. The installed price range appears in its own block, with its source and date. That range is modeled for installed cost; it is not an installer's quote.