Rheem RTG-84DVLN-3

The 206 therms figure is calculated by this site, not taken 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 high draw pattern. This model's UEF is 0.82. So the figure describes gas use at the federal test's daily draw, not at the draw of any particular home. A household that uses more hot water than the test assumes would be expected to use more gas. A household that uses less would be expected to use less. The registry data behind the figure comes from the DOE CCD, retrieved 2026-09-19. The method is set out on the page explaining how the annual cost is calculated.

The high draw pattern is the test category for a larger household, or one where showers and laundry overlap. The registry lists this unit's maximum flow rate in gallons per minute at 4.5. Its class is the 397 gas tankless models tested at the high draw pattern. Within that class it sits in the second-highest quarter for energy use. It ranks 229th for lowest energy use, so more models in the class use less gas at the same test draw than use more. If a household is closer to a lower draw pattern, the 206 therms figure does not apply to it. Figures for other draw patterns are not available on this page. To check another model in the same class, use the tool to find a same-class replacement by model number.

The running cost is not given in this text because it depends on the reader's state average residential gas price. The page works it out from the reader's ZIP, using the 206 therms figure at the high draw pattern. The gap of 24 therms above the class median of 182 therms is a gap in gas use at the test draw. What that gap costs also depends on the reader's rate, so it is not stated here. The cost calculator on the reader's own ZIP shows both figures for that rate. The installed price shown in its own block is a modeled range, not a quote. Its source and date appear in that block, and its figures are not repeated here.