Fogatti FDG-CS120

The registry lists this model's UEF, the ratio of hot water delivered to energy used, as 0.84. This site combined that 0.84 with the DOE test's daily hot-water draw for the medium draw pattern to reach 132 therms of natural gas a year. The figure is computed by this site, not reported by the registry. The source is the DOE CCD, retrieved 2026-09-19. Against the 80 models registered as a gas tankless unit at the same draw pattern, the 3 therms gap to the class median of 135 therms places it 23rd lowest, in the second-lowest quarter of its class for energy use. The comparison holds only at the medium draw pattern; other draw patterns are not covered by this figure.

The figure suits a household whose hot-water use resembles the medium draw pattern, because 132 therms is tied to that daily draw. A household that draws more or less hot water will use a different amount of gas, and the data here does not say how much. The registry lists this model's maximum flow rate in gallons per minute as 3. That is a capacity limit at the unit's rating, not an energy measure, and this page has no data on whether it covers several fixtures running together. To compare other fuels, spaces or sizes, use the selector by fuel, space and size. To check a same-class alternative, find a replacement by model number.

Running cost is not stated here because it depends on the state average residential gas price, and that price differs from state to state. The calculation multiplies the 132 therms at the medium draw pattern by the price for your state. Enter your ZIP in the cost calculator to see the result, and read how the annual cost is calculated for the inputs. The gap of 3 therms from the class median of 135 therms also turns into a cost difference only on your own price. The modeled installed-cost range appears in its own block on this page with its source and date. It is not a quote, and it is not repeated in this text.