Water heater energy factor comparison
Im looking at a sealed combustion direct vent (non-powered) water heater with an energy factor rating of .60. Comparatively, the same maker’s atmospheric vented heater with similar specs has a rating of .62.
Is my assumption correct that the energy factor doesn’t reflect the added efficiency of the sealed combustion unit utilizing outside air, as opposed to the atmospheric vented unit which is using heated air in the house, and also potentially encouraging infiltration of outside air?
The direct vent/sealed combustion unit is markedly more expensive than the atmospheric vented unit, and though I’m aware of the benefits of the sealed combustion, particularly in my “pretty good” construction, I’m wondering if that added expense might realize a little payback in heating energy consumption.
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