VESTA VHP-199

This site computed the 178 therms figure; the registry does not list 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 draw pattern. For the VHP-199, the registry lists a UEF of 0.95, retrieved from the DOE CCD on 2026-09-19. The figure is a value under test conditions, not a measurement from any particular home. Actual gas use rises or falls with the hot water a household draws. The page on how this site calculates annual energy and running cost lists each input and its source.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The VHP-199 is registered with a maximum flow rate in gallons per minute of 5.7. A household whose overlapping showers and appliances stay within 5.7 matches the conditions behind the 178 therms figure. A household that routinely needs more flow than 5.7 is outside what the registry lists for this unit. A smaller household with a lighter daily draw is also outside the test's high draw pattern, so the 178 therms figure is likely to overstate its gas use. The registry does not give this model's energy use at other draw patterns, so that figure is not available here. To compare models in the same class, use the same-class replacement search by model number.

The 4 therms gap to the class median, noted above, is measured across the 397 models registered as a gas tankless unit at the high draw pattern. Tank heaters and other draw patterns are not part of that comparison. This text does not state a running cost. It depends on your state's average residential gas price, so the page computes it from your ZIP. The running-cost calculator for your own ZIP applies that rate to the 178 therms figure. The installed-cost range appears in its own block on this page, with its source and date. It is a modeled range, not a quote.