Rheem RTGH-84DVLN-3

The 182 therms figure comes from this site's own calculation. The registry does not publish it. The registry lists a UEF, the ratio of hot water delivered to energy used, of 0.93 for this model. The site combines that value with the DOE test's daily hot-water draw for the high draw pattern. The source is the DOE CCD, retrieved 2026-09-19. Because the test fixes the daily draw, the figure shows use under the test condition, not in any particular home. Actual gas use in a given household is not available here. The method behind the annual cost calculation sets out how the site converts this figure into a yearly cost.

The high draw pattern stands for a larger household, or one where showers and laundry overlap. The registry lists a maximum flow rate in gallons per minute of 4.5 for this unit. Whether that flow covers a specific home depends on how many fixtures run at once, and the registry does not record that. A home with lower daily hot-water use does not match the test condition behind the 182 therms figure. This page has no figures for this model at other draw patterns. To compare units on fuel, space and size, use the water heater selector by fuel, space and size. To find another unit in the same class, use the same-class replacement search by model number.

The rank above compares this unit with the 397 models registered as a gas tankless unit at the high draw pattern. At 183rd, this unit falls in the second-lowest quarter of that class for energy use. Every model in the class is tested at the same daily draw, so the rank compares test results, not household bills. This text does not state a running cost. It depends on your state's average residential gas price, so the page calculates it from your ZIP. The cost calculator for your own ZIP applies that rate to the 182 therms figure. The installed-cost range in its own block is a modeled range with its source and date. It is not a quote.