VESTA VTP-199

This site computes the 176 therms figure; it is not taken from the registry. It combines two inputs. The first is the registry's UEF, the ratio of hot water delivered to energy used, which is 0.96 for this model. The second is the daily hot-water draw the DOE test sets for the high pattern. Both come from the DOE Compliance Certification Database (CCD), retrieved 2026-09-19. The figure holds only at the test's daily draw. A home that draws more or less hot water each day will use more or less gas. The page on how the annual cost is calculated sets out each step. Among the 397 models in its class, this unit ranks 12th lowest in energy use, which places it in the lowest quarter of its class.

The high draw pattern describes a larger household, or one where showers and laundry overlap. Because the 176 therms figure is tied to that pattern, it applies most directly to homes with that level of use. A smaller household with a lower daily draw will likely use less gas than the stated figure, but the data here do not show this model's energy use at other draw patterns. The registry lists a maximum flow rate in gallons per minute of 6. The data do not state the temperature rise behind that rating, so whether it covers several fixtures at once in a given home is unknown here. To compare other heaters by these factors, use the water heater selector by fuel, space and size.

This text does not give a running cost. The cost depends on your state's average residential gas price, so the page calculates it from your ZIP code. You can check it with the cost calculator on your own ZIP. The 6 therms gap to the class median is also measured at the test's daily draw. What that gap is worth each year depends on the same gas price. A separate block on this page shows the installed price as a modeled range, with its source and date. That range is not a quote. If you are verifying a like-for-like swap, you can find a same-class replacement by model number among the 397 gas tankless models at the high pattern.