Fogatti FDG-PM180S

The 206 therms figure does not appear in the registry itself. This site calculated it from the registry's UEF, the ratio of hot water delivered to energy used. The calculation also uses the DOE test's daily hot-water draw for the high draw pattern. This model's UEF is 0.82, from DOE CCD, retrieved 2026-09-19. Among the 397 gas tankless units registered at the high draw pattern, it ranks 229th lowest in energy use. That puts it in the second-highest quarter of its class for energy use. The figure applies only at the federal test's daily draw. A household that uses more or less hot water will use a different amount of gas. The steps are explained in how the annual cost is calculated.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. This model's registered maximum flow rate in gallons per minute is 4.5. The 206 therms figure describes that kind of household at the federal test's draw. It does not describe a home with lower daily hot-water use, and figures for that home are not available here. If you are checking energy use, note that this model sits 24 therms above the 182 therms class median. To check other models in the same class, you can find a same-class replacement by model number. To compare across fuels or sizes instead, use the selector by fuel, space and size.

This text does not state a running cost. The cost 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 206 therms a year. The cost calculator on the reader's own ZIP shows that result. Every model in the class is priced at the same local rate. So at any gas price, this model's cost stays higher than the median model's cost, because of the 24 therms gap. The installed price appears in its own block with its source and date. It is a modeled range, not a quote. This page does not have a household's actual gas use, which may differ from the test-based figure.