eyoo EA65ZH

The figure of 135 therms is not a registry entry. This site computed it from the registry's UEF and the DOE test's daily hot-water draw for the medium draw pattern. UEF, the ratio of hot water delivered to energy used, is 0.82 for this model. The energy source is DOE CCD, retrieved 2026-09-19. The figure applies only to natural gas and only to the federal test's daily draw. It describes test conditions, not a measurement of any installed unit, so a household that draws more or less hot water than the test will use a different amount.

Among the 80 models registered as a gas tankless unit at the medium draw pattern, this model ranks 32nd lowest for energy use. That places it in the second-lowest quarter of its class. Its difference from the class median of 135 therms is 0 therms, so on energy use the registry data does not separate it from the middle of this class. The comparison holds the draw pattern and the fuel fixed, so it says nothing about other draw patterns or other fuels. To check other units in the same class, find a same-class replacement by model number.

This model fits a household on natural gas whose hot-water use resembles the medium draw pattern, because the 135 therms figure was computed for that case. It fits less well where the fuel or the daily draw differs, since the figure does not carry over. The maximum flow rate in gallons per minute is 3.9. The registry data used here does not state the temperature rise at that flow, so that detail is not available. Running cost depends on your state's average residential gas price, so no cost is written in this text. Use the cost calculator on your own ZIP, and read how the annual cost is calculated for the method.