Ruud PROP G40-50* RH HE EC3

This site computes the 188 therms figure. The registry does not publish it. The figure combines this model's UEF, the ratio of hot water delivered to energy used, with the DOE test's daily hot-water draw for the high pattern. The registry lists a UEF of 0.9 for the PROP G40-50* RH HE EC3. The source data comes from the DOE CCD, retrieved 2026-09-19. The figure applies only at the test's daily draw. A household using more or less hot water than the test assumes will burn a different amount of gas. That amount is not available here. Among the 414 gas tank models at the high draw pattern, the 72 therms gap puts this unit in the lowest quarter for energy use.

The high draw pattern describes a larger household, or one where showers and laundry overlap. The registry lists this unit's first hour rating, the gallons of hot water available in the first hour from a full tank, at 88 gallons. Its rated volume is 40 gallons. The 188 therms figure assumes the high pattern's daily draw, so it does not describe a smaller household's use. Models registered at a different draw pattern are not part of this class of 414. Their energy figures do not compare like for like with this one. To compare models across classes, use the water heater selector by fuel, space and size. To stay within this class, try the same-class replacement search by model number.

This text does not state the running cost. The cost depends on your state's average residential gas price, so the page calculates it from your ZIP. You can see that cost for the 188 therms figure with the water heater cost calculator for your ZIP. Your rate also sets the value of the 72 therms gap to the class median. The steps behind the calculation are described in how the annual water heater cost is calculated. No installed price range is published for this model. Its ratings fall outside the range the cost database's model was fitted on. The page does not extend that range to cover them, so the installed price is unknown here.