Fogatti FDG340IN-CS90-NG

The figure of 93 therms was computed by this site, not the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, of 0.82 with the DOE test's daily hot-water draw for the low draw pattern. The fuel is natural gas, and the source is the DOE CCD, retrieved 2026-09-19. The value applies only at that test draw. Actual use in a home depends on how much hot water the household draws, and this page has no measured household figure. The maximum flow rate in gallons per minute is 2.2. It is a separate rating and is not an input to the annual figure computed here.

Among the 10 models registered as a gas tankless unit at the low draw pattern, this one ranks 4th lowest for energy use. That places it in the second-lowest quarter of its class. Its 93 therms equals the class median of 93 therms, so the difference is 0 therms. The unit suits a one- or two-person household whose hot-water use resembles the low draw pattern, since the figure is valid only at that draw. It does not describe a larger household, and energy use at other draw patterns is not available on this page. To compare by fuel, space and size, the water heater selector filters by those inputs, and a same-class replacement by model number can be looked up separately.

Running cost is not stated in the text because it depends on the state average residential gas price, which differs by reader. To compute it for 93 therms, use the cost calculator on your own ZIP. The page explaining how the annual cost is calculated sets out the method. The installed price range appears in its own block with its source and date, as a modeled range and not a quote, so it is not repeated here. Because the figure holds only at the low draw pattern, a household with a different draw will get a different result. The size of that difference is unknown.