I'm working on a unit where I could use either natural gas or electric for
the water heater.
I see various energy cost comparisons where the gas unit appears to operate
at somewhat less cost.
The water heater would be within the living space (1st floor) and a flue for
the gas unit
would run vertically through the roof. In thinking about energy cost
calculations for colder climates, does
any of the analyses take into consideration the cold air coming down the
flue vent into the living
space, and also the cost of consuming heated air from the living space for
the combustion?
thanks
bill