Ruud PRO+G55-50N RH59

This site computes the 273 therms figure; the registry does not publish it. The calculation starts from the registry's UEF, the ratio of hot water delivered to energy used, which is 0.62 for this model. That ratio is applied to the DOE test's daily hot-water draw for the high pattern. The UEF comes from the DOE Compliance Certification Database, retrieved 2026-09-19. On that basis, the model ranks 367th lowest in energy use of 414. That rank places it in the highest quarter of its class for energy use. The figure holds only at the test's daily draw. The registry gives no energy figure for other usage levels, so this page does not have one. The steps are set out in how this site calculates annual energy and cost.

The high draw pattern describes a larger household, or one where showers and laundry overlap. This model's first hour rating, the gallons of hot water available in the first hour from a full tank, is 91 gallons. Its rated volume is 55 gallons. Those two figures describe how much hot water it delivers. The energy figure describes how much gas it uses to do so at the test's draw. A reader whose household matches the high pattern can check the model against that use. A reader who ranks annual energy first should note its 367th position. Every model ranked ahead of it in this class uses less gas at the same draw. Those models can be compared through a same-class replacement search by model number.

This text does not state the running cost. It depends on the reader's state average residential gas price. The page computes it from the reader's ZIP, using the 273 therms figure at the high draw pattern. The same rate applies to the 13 therms gap above the class median. This text therefore does not give the cost of that gap either. To see both at your own rate, enter a ZIP in the water heater running-cost calculator. The installed price range appears in its own block on this page, with its source and date. It is a modeled installed-cost range, not a quote from an installer.