Ranein RO11K-Y

This site calculates the 206 therms figure; the registry does not publish it. It uses the model's UEF, the ratio of hot water delivered to energy used, which is 0.82. It also uses the daily hot-water draw set by the DOE test. That draw belongs to the high pattern, meaning a larger household, or one where showers and laundry overlap. The UEF comes from the DOE CCD, retrieved on 2026-09-19. Among the 397 gas tankless models registered at the high pattern, this unit ranks 229th lowest in energy use. Both the figure and the rank hold only at the test's daily draw. Energy use in any particular home is not available here. The calculation steps are set out on the page explaining how the annual cost is calculated.

The 206 therms figure is most relevant to a household whose daily use matches the high pattern the test assumes. For that load, the registry lists a maximum flow rate in gallons per minute of 4.7. The figure is a weaker reference where hot-water use is lighter than the high pattern. The 206 therms value does not carry over to lower use, and this page has no figure for lower use. A reader comparing efficiency within the class should note the rank. At 229th lowest of 397, most models in its class use less energy at this pattern. To compare models in the same class, use the same-class replacement search by model number.

This text does not state a running cost, because the cost depends on the reader's state average residential gas price. The page multiplies the 206 therms of natural gas at the high pattern by that price, which it takes from the reader's ZIP. In a state with a higher gas price, the same 206 therms gives a higher result. The 24 therms above the class median is priced at the same rate, so its cost also depends on the state. You can run the figure in the cost calculator on your own ZIP. The installed price range appears in its own block with its source and date. It is a modeled range, not a quote.