VESTA VRP-PLUS-150

This site calculates 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 draw pattern. The registry lists a UEF of 0.95 for this unit. The result is an estimate under test conditions at that daily draw. It is not a measurement from any home. The registry has no figure for a home whose daily hot-water use differs from the test draw. The source is DOE CCD, retrieved 2026-09-19. The steps behind the figure are set out on the page explaining how the annual cost is calculated.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. The registry lists this model's maximum flow rate in gallons per minute as 4.7. The data does not show whether that rating covers a particular set of fixtures running at the same time. At 178 therms, it ranks 45th lowest in energy use among the 397 gas tankless units rated at the high draw pattern. That rank puts it in the lowest quarter of its class. At the test draw, it uses 4 therms a year less than the 182 therms class median. Units rated at other draw patterns belong to other classes, so this rank does not compare it with them. The selector by fuel, space and size covers those other classes.

The text on this page gives no running cost. What 178 therms of natural gas costs depends on your state's average residential gas price. The page calculates that cost from your ZIP. The 4 therms gap to the class median also depends on that same rate. The installed price is shown in a separate block with its own source and date. That price is a modeled installed-cost range, not a quote. To see the annual figure at your own rate, open the cost calculator for your ZIP. To compare another unit from the same class with this model's 45th rank, use the tool to find a same-class replacement by model number.