Ranein RE13K

The 3,531 kWh figure is computed by this site, not published by the registry. The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.92. This site combines it with the DOE test's daily hot-water draw for the medium draw pattern. The source is the DOE CCD, retrieved 2026-09-19. The fuel is electricity, and the unit is an electric tankless heater. The figure describes the test condition only, not measured use in a particular home. A household that draws more or less hot water than the test assumes will see a different result. The method behind the annual figure is documented separately.

The medium draw pattern represents a typical three- or four-person household. The 3,531 kWh figure suits a reader whose hot-water use resembles that pattern and who wants a check against the registry entry for the RE13K. The registry also lists a maximum flow rate in gallons per minute of 3.1. How that rate changes with inlet water temperature is not in the data, so it is not available here. The figure suits a household with heavier use less well, because 3,531 kWh would then understate its consumption. For a same-class unit, the replacement lookup by model number is the place to start.

Running cost is not stated in the text, because it depends on your own utility electricity tariff. Multiplying 3,531 kWh by your rate per kilowatt-hour gives the yearly cost at the medium draw pattern. The cost calculator does this from your ZIP. The UEF of 0.92 is already built into the annual figure, so it is not applied a second time. Rank in class is not available, because too few models share this class and draw pattern for a fair median. The installed price range appears in its own block, with its source and date, as a modeled range and not a quote. To compare units by fuel, space and size, use the water heater selector.