STATE ATO-199B-N 1**

This site computes the 206 therms figure; the registry does not list it. The calculation starts from the model's UEF, the ratio of hot water delivered to energy used, which is 0.82. It then applies the DOE test's daily hot-water draw for the high draw pattern. The registry values come from the DOE Compliance Certification Database, retrieved 2026-09-19. The figure applies only at that test draw and does not measure any particular home. This model ranks 229th lowest in energy use among the 397 gas tankless models registered at the high draw pattern. That puts it in the second-highest quarter of its class for energy use, 24 therms a year above the class median of 182 therms.

The high draw pattern covers a larger household, or one where showers and laundry overlap. The registry lists this model's maximum flow rate in gallons per minute as 5. The 206 therms figure is the right comparison for a home that fits that pattern. For a household that uses less hot water, this figure does not describe the load. The registry does not give an energy figure for that household's actual use. If the 24 therms gap to the class median matters for the job, you can find a same-class replacement by model number. You can also narrow the options with the water heater selector by fuel, space and size.

The text on this page does not state a running cost. The cost of 206 therms of natural gas depends on your state's average residential gas price. For that reason, the page calculates the cost from your ZIP code. You can run the same calculation in the cost calculator for your own ZIP. The method behind the annual cost explains each input. The installed-price range appears in its own block, with its source and date. It is a modeled range, not a quote. Neither figure changes this model's rank of 229th of 397, which is based on energy use alone.