Ruud RTGH-90DVLN-3

This site calculates the 182 therms figure. The registry does not list it. The calculation 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 0.93, taken from the DOE CCD on 2026-09-19. The class is the 397 gas tankless models registered at the high draw pattern. Within that class, this model differs from the median of 182 therms by 0 therms. It ranks 183rd lowest in energy use out of 397, which puts it in the second-lowest quarter of its class. For the steps behind the annual figure, see how the annual energy and cost figures are calculated.

The high draw pattern represents a larger household, or one where showers and laundry overlap. The 182 therms figure applies only to that daily usage. For this model, the maximum flow rate in gallons per minute is 4.9. If your home's daily hot-water use matches the high pattern, the annual figure applies to you directly. If your household draws less hot water, the 182 therms figure does not describe your use. This page has no energy figure for lower usage, and the registry data used here does not provide one. To compare other units, use the water heater selector by fuel, space and size. Each unit there is shown with its own draw pattern.

This text leaves out the running cost because it depends on your own gas rate. The page prices the 182 therms of natural gas a year at your state's average residential gas price, which it finds from your ZIP. So readers in different states will see different yearly costs for the same Ruud RTGH-90DVLN-3. You can calculate that cost in the running-cost calculator for your own ZIP. The installed price range is shown in its own block on this page, with its source and date. That range is a modeled installed-cost estimate, not an installer's quote. Neither the rate nor the price range changes the model's energy rank of 183rd out of 397.