VESTA VXP 9

The 176 therms figure does not appear in the registry itself. This site calculated it from two inputs. The first is the registry's UEF, the ratio of hot water delivered to energy used. The second is the DOE test's daily hot-water draw for the high draw pattern. The VESTA VXP 9 is listed with a UEF of 0.96 in the DOE CCD, the Department of Energy's certification database, retrieved 2026-09-19. The figure assumes the test's daily draw. A household that uses more or less hot water will use a different amount of gas. The registry data does not show how large that difference would be. The page on how this site calculates annual energy and cost explains each step.

Within its class, the VESTA VXP 9 ranks 12th lowest for energy use among 397 models. That puts it in the lowest quarter of the class, 6 therms a year below the 182 therms median. The class includes only gas tankless units tested at the high draw pattern, so the comparison applies only under that condition. The high draw pattern describes a larger household, or one where showers and laundry overlap. The registry lists a maximum flow rate in gallons per minute of 6 for this model. Whether that flow is enough for a given home depends on how many fixtures run at once. The registry does not record that. To check other units in the same class, use the same-class replacement finder by model number.

A smaller household draws less hot water than the high draw pattern assumes, so the 176 therms figure does not describe its use. The data on this page gives no figure for this model at a lower draw pattern, so that value is not available. This text also does not state the running cost. That cost depends on your state's average residential gas price, so the page calculates it from your ZIP. It starts from the same 176 therms at the high draw pattern. The annual cost calculator for your ZIP gives the result for your rate. The installed price range appears in a separate block, with its source and date. It is a modeled range, not a quote.