RINNAI RE180E (REU-VE2432WD-US)

The 206 therms figure is not a registry field. This site computed it from two inputs: the registry's UEF, the ratio of hot water delivered to energy used, and the DOE test's daily hot-water draw for the high pattern. This model's UEF is 0.82. The result holds only at that test draw. A household that uses more or less hot water will use more or less gas. The registry values come from the DOE CCD, retrieved 2026-09-19. The page reports no measured figure from a real home, so actual use in any given house is unknown. The full calculation is set out in how this site calculates annual energy use and cost.

Among the 397 gas tankless models registered at the high draw pattern, this unit ranks 229th for lowest energy use. That places it in the second-highest quarter of its class for energy use, 24 therms above the class median of 182 therms. The high pattern stands for a larger household, or one where showers and laundry overlap. That household is the case the energy figure describes. The unit's maximum flow rate in gallons per minute is 4.2. For a smaller household, this figure does not apply, and a figure at a lower draw pattern is not available on this page. Models below the class median use less gas at the same test draw; to compare them, use the same-class replacement search by model number.

Running cost is not stated here because it depends on your state's average residential gas price. The page computes it from your ZIP, applying that price to the 206 therms yearly figure at the high draw pattern. Your own price is unknown to this page until you enter a ZIP in the water heater cost calculator for your ZIP. The result carries the same condition as the energy figure: it assumes the federal test's daily hot-water draw, not your household's measured use. At the same gas price, this model's yearly gas use exceeds the median model's by 24 therms. The installed price range appears in its own block on this page, with its source and date. It is a modeled range, not a quote.