Noritz NRC711-OD-NG

This site calculates the 190 therms figure. The registry does not publish it. The calculation uses the registry's UEF, the ratio of hot water delivered to energy used. It pairs that value with the DOE test's daily hot-water draw for the high draw pattern. For the NRC711-OD-NG, the UEF is 0.89. Both inputs come from the DOE CCD, retrieved 2026-09-19. The figure applies only at the federal test's daily draw. A household that uses more or less hot water than the test assumes will use a different amount of gas. This page cannot measure that difference, so it is not available here. The full steps are on the page about how the annual cost is calculated.

The high draw pattern describes a larger household, or one where showers and laundry overlap. A reader in that situation is comparing like with like when using the 190 therms figure. The registry lists a maximum flow rate in gallons per minute of 4.3 for this model. The data here does not state the temperature rise behind that rating, so that condition is unknown. Within the 397 gas tankless models at the high draw pattern, its rank of 223rd places it in the second-highest quarter for energy use. A reader who needs a unit at or below the 182 therms median will find this one 8 therms above it. The selector by fuel, space and size lists other models in the same class.

The yearly running cost is not stated in this text. It depends on the average residential gas price in the reader's state. The page calculates it from the reader's ZIP by applying that price to the 190 therms figure. The same price applies to the 8 therms gap between this model and its class median. The cost calculator on your own ZIP shows the result for your rate. The installed price appears in a separate block, with its own source and date. That block shows a modeled installed-cost range, not a quote from an installer. Both the running cost and the installed price change with location, so this page gives no single national figure for either.