that hot water evaporates quicker. However, in my case, by the time the
water gets to the evaporator it is cold again. Furthermore, there is
the issue of waste water. I'd go for the cold if I were to do it again
in my layout.
Looking at my set up, the water travels through about 8 feet of small
copper tubing, so, if it were hot, it would certainly be near room
temperature by the time it got to the humidifier.
Also the heat of vaporization of water is considerably higher than the
temperature differential between hot and cold water.
I have an Aprilaire hooked up to hot water through about 8 t
of 1/4" copper tubing. The water is still very hot when it
enters the unit. You just don't lose that much heat in
8 ft of tubing, unless it's at a unusually slow flow rate.
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