Richmond RTG-70XLN-1

The 209 therms figure is computed by this site, not published by 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. That draw belongs to the high draw pattern only. For this model the UEF is 0.81, from DOE CCD data retrieved 2026-09-19. Among the 397 models registered as a gas tankless unit at the high draw pattern, it ranks 323rd for lowest energy use. The site's method is set out on the page explaining how the annual cost is calculated. The figure describes the test's daily draw, not any particular home. How much gas this unit uses in your household is not available from the registry.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The 209 therms figure applies to that level of use and to no other pattern. The registry lists this model's maximum flow rate in gallons per minute as 4. How many fixtures that covers at once in a given home is not stated in the data. For a reader focused on gas use, the model sits 27 therms above the class median of 182 therms. Given its rank in the class, most of the 397 models there use less gas at this draw. To compare against those models, you can find a same-class replacement by model number. You can also narrow the field with the selector by fuel, space and size.

Running cost is not written in this text. It depends on your state's average residential gas price, so the page computes it from your ZIP. The calculation starts from the 209 therms of natural gas at the high draw pattern. You can repeat it with the cost calculator on your own ZIP. This model uses 27 therms more than the class median. At the same gas rate, its running cost is therefore higher than that of a model at the class median of 182 therms. The installed-price range appears in its own block on this page, with its source and date. That range is a modeled installed cost, not a quote, and it is not restated here.