Richmond RTGH-RH11DVLN *

The 180 therms figure is computed by this site, not taken from the registry. It starts from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.94 for this model. It then applies the DOE test's daily hot-water draw for the high pattern. That pattern stands for a larger household, or one where showers and laundry overlap. The figure holds only at the federal test's daily draw. This page has no energy figure for this model at other usage levels, so that value is not available here. The UEF and the test draw come from DOE CCD data retrieved 2026-09-19. The steps behind the figure are set out in how the annual energy and cost are calculated.

Within its class, this model ranks 165th lowest in energy use of the 397 gas tankless units registered at the high draw pattern. Its 180 therms sits 2 therms below the class median of 182 therms. That places it in the second-lowest quarter of the class for energy use. Its 165th rank also means other models in the class are registered with lower energy use at the same pattern. The registry lists its maximum flow rate in gallons per minute as 6. These figures describe a household that matches the high pattern. For a home with lighter daily use, an energy figure at that pattern is not available on this page. To compare registered units of the same class, use find a same-class replacement by model number.

The running cost for this model is not stated in this text. It depends on your state's average residential gas price. The page therefore applies your rate to the 180 therms figure once you enter a ZIP. Any cost shown this way carries the same condition as the energy figure: the high draw pattern at the federal test's daily draw. You can run the same calculation in the cost calculator on your own ZIP. The installed price range appears in its own block on this page, with its source and date. It is a modeled installed-cost range, not a quote, and this text does not restate its figures.