STATE ATM-140M-N 1**

The registry does not publish the 178 therms figure; this site computed it. The inputs are the registry's UEF, the ratio of hot water delivered to energy used, and the DOE test's daily hot-water draw for the high pattern. For this model the UEF is 0.95, and the source is the DOE CCD, retrieved 2026-09-19. Among the 397 gas tankless models registered at the high draw pattern, it ranks 45th lowest for energy use. That rank places it in the lowest quarter of its class. The figure holds only at the test's daily draw; this data does not give use at any other draw. The steps are set out in how the annual energy and cost figures are calculated.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. If that matches the home in question, the 178 therms figure is the relevant one. The registry lists this unit's maximum flow rate in gallons per minute as 4.1. Fixtures that together call for more than 4.1 at once fall outside what this listing describes. For a smaller household, the high-pattern figure does not match the usage, and this data holds no lower-pattern figure for this model. If the home uses a different fuel or needs a different size, the water heater selector by fuel, space and size covers other classes. To check models in the same class, use the same-class replacement search by model number.

The text gives no running cost for this model. That cost depends on your state's average residential gas price, so the page computes it from your ZIP. It prices the 178 therms of natural gas at your rate, at the high draw pattern's test draw. You can rerun it in the cost calculator for your own ZIP. Measured against the 182 therms class median, the yearly cost gap is the 4 therms difference priced at that same rate. The installed price range sits in its own block, with its source and date. It is a modeled installed-cost range, not a quote, and this text does not restate it. A cost for usage other than the test draw is not available here.