THERMALUX NRC111DV (GQ-C3257WX-FF US)

This site computed the 186 therms figure; the registry does not publish it. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the high draw pattern. This model's UEF is 0.91, taken from the DOE CCD as retrieved on 2026-09-19. The class is the 397 gas tankless units registered at the high draw pattern, and its median is 182 therms. This model ranks 213th lowest energy use, which places it in the second-highest quarter of its class. Its gap to the median is 4 therms a year, under the same federal test conditions. The page on how the annual figure is calculated sets out each step.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. The 186 therms value applies to that usage level only. A home that uses less hot water each day than the federal test would use a different amount of gas. This page does not give that amount. The unit's maximum flow rate in gallons per minute is 5.7. That is the registry's rating of how much hot water it can deliver at once. The registry data does not say whether that rate covers the fixtures a given home runs together. If you are matching a unit already in place, use the page to find a same-class replacement by model number. It lists other models registered at the high draw pattern.

This text does not state a running cost because the cost depends on your state's average residential gas price. The page computes it from your ZIP by applying that rate to 186 therms of natural gas at the high draw pattern. At a higher gas rate, the same 186 therms costs more per year. The 4 therms gap to the 182 therms class median changes cost the same way, scaled by your rate. The installed price range appears in its own block, with its source and date. It is a modeled installed-cost range, not a quote. To run the energy figure on your own rate, use the cost calculator for your ZIP.