FRIEDRICH RTG-70DVLN-3

The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.82 for this model. This site combined that UEF with the DOE test's daily hot-water draw for the high draw pattern to reach 206 therms. The registry does not publish that annual figure itself. The source is DOE CCD, retrieved 2026-09-19. Among the 397 models registered as a gas tankless unit at the high draw pattern, this one ranks 229th lowest energy use. That places it in the second-highest quarter of its class for energy use, with a gap of 24 therms above the class median of 182 therms. The calculation is described in how the annual cost is calculated.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The 206 therms figure applies only to that test condition. For a household with lighter use, the actual gas use would differ, and this page does not estimate it. The registry gives a maximum flow rate in gallons per minute of 4 for this model. The data does not say how many fixtures that flow serves at a given incoming water temperature, so that detail is not available here. A reader who wants a different fuel, space or size can start from the selector by fuel, space and size instead of this model page.

The running cost is not stated in the text because it depends on your state's average residential gas price. The cost calculator on your own ZIP applies that price to 206 therms, the annual use at the high draw pattern. The same price applied to the 24 therms gap above the 182 therms class median shows what the difference costs you. The installed price range appears in its own block with its source and date, as a modeled range and not a quote. If you need a unit in the same class, you can find a same-class replacement by model number and compare its annual energy at the same draw pattern.