RINNAI (RX130I) REU-NB2024FF-US

This site calculates the 114 therms figure; the registry does not list it. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the daily hot-water draw that the DOE test sets for the medium draw pattern. The UEF for this model is 0.97, from the DOE CCD retrieved 2026-09-19. The figure is only valid at that test draw. A household that uses more or less hot water than the medium pattern will burn a different amount of gas. That amount is not available in this data. The steps behind the figure are set out on the page about how the annual energy and cost figures are calculated.

The comparison class is the 80 models registered as a gas tankless unit at the medium draw pattern. Within that class, this unit ranks 1st lowest in energy use. That puts it in the lowest quarter of its class, 21 therms below the 135 therms median. The rank only applies at this draw pattern, and the data here does not rank the unit at any other pattern. Its maximum flow rate in gallons per minute is 3.8. This data does not say whether that flow covers several fixtures running at once. If a home's daily use differs from the medium pattern, these figures do not describe it. To check other units in the same class, use the same-class replacement search by model number.

The running cost is not stated here because it depends on your state's average residential gas price. The page works it out from your ZIP code and applies that price to the 114 therms at the medium draw pattern. The 21 therms gap to the class median is priced at the same rate, so its value also depends on where you live. You can see both results in the running-cost calculator for your own ZIP code. The installed price range has its own block on this page, with its source and date. It is a modeled range of installed cost, not a quote, and it does not change the energy figures above.