Fogatti FDG420IN-CS120-LP

The 132 therms figure comes from this site's calculation, not from the registry. It combines the registry's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the medium pattern. This unit's UEF is 0.84, from the DOE CCD, retrieved 2026-09-19. The medium pattern represents a typical mid-sized household with a busy morning of hot-water use. The figure holds only for that test day. If your home uses more or less hot water, actual gas use will differ from 132 therms. This site does not have your household's real usage, so that difference is unknown here. The page on how the annual energy and cost figures are calculated sets out each input.

Within its class, this unit ranks 23rd lowest energy use of 80. That places it in the second-lowest quarter of gas tankless models tested at the medium draw pattern. The registry lists a maximum flow rate in gallons per minute of 3. The rating fits a household whose daily demand resembles the medium test day. It does not describe homes that need more than 3 gallons per minute at once, such as several fixtures running together. For those homes, the 132 therms figure and the class rank do not show how the unit will perform. To check other models in the same class, use the same-class replacement search by model number.

This text gives no running cost. The cost depends on your state's average residential natural gas price, so the page calculates it from your ZIP. The energy input stays at 132 therms a year at the medium draw pattern; only the gas price changes. Readers in different states will therefore see different yearly costs for the same unit. The modeled installed-cost range sits in its own block on this page, with its source and date, and it is not a quote. Your actual bill may also differ because your hot-water use may differ from the test day. You can recalculate the yearly figure with the running cost calculator for your own ZIP.