RINNAI (V75I)REU-VC2528FFU-US

This site computed the 206 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. For this model the UEF is 0.82. The source is the DOE CCD, retrieved 2026-09-19. The figure holds only at that test draw. A household that uses more or less hot water than the test assumes will use a different amount of gas. The steps are set out on the page explaining how the annual energy and cost are calculated. The registry data does not include measured gas use at any specific address.

Among the 397 gas tankless models registered at the high draw pattern, this unit ranks 229th from the lowest energy use. That puts it in the second-highest quarter of its class for energy use. The high pattern stands for a larger household, or one where showers and laundry overlap. For that kind of household, the 24 therms a year above the class median is a like-for-like comparison. The registry lists its maximum flow rate in gallons per minute as 4. A reader checking a quoted unit against others in the same class can find a same-class replacement by model number.

The 206 therms figure does not describe a smaller household's use, because it assumes the high pattern's daily draw. This page has no estimate at a lower draw. This page also does not state the running cost. It depends on the reader's state average residential gas price, so the page computes it from the reader's ZIP. The cost calculator for your own ZIP applies that rate to 206 therms of natural gas a year. The installed-cost range appears in its own block, with its source and date. It is a modeled range, not a quote.