Ranein RH10K-NG

The 206 therms figure is computed by this site, not published by the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the daily hot-water draw in DOE's test. The Ranein RH10K-NG is listed with a UEF of 0.82, from the DOE CCD retrieved on 2026-09-19. The class here means the 397 models registered as a gas tankless unit at the high draw pattern. Within that class, a rank of 229th places this model in the second-highest quarter for energy use. The figure holds only at the test's daily draw. A home drawing a different daily volume will see different gas use. The full method is on the page explaining how the annual energy and cost figures are calculated.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. The Ranein RH10K-NG lists a maximum flow rate in gallons per minute of 4.3. The registry gives no figure for how that rate holds with several outlets open at once. That detail is not available here. Because this model ranks 229th in its class, lower-use models exist at the same draw pattern. A reader who puts energy use first can look them up with a search for a same-class replacement by model number. The selector by fuel, space and size covers other fuels and sizes. Neither tool changes the 206 therms figure for this model.

No running cost appears in this text. The cost of 206 therms of natural gas a year depends on your state's average residential gas price. The page therefore computes it from your ZIP. The cost calculator for your own ZIP applies that rate to this model's figure. The same rate applies to the 24 therms gap noted above, so its cost also varies by state. The installed price range sits in its own block, with its source and date, as a modeled installed cost rather than a quote. Durability, service life and fitting requirements are not in the registry data used here. They are unknown on this page.