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Old 11-14-2012, 08:10 AM   #1
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Hot water vs cold to humidifier

Has anyone done any research as to whether there is any difference in humidification by using the cold water line vs hot water to feed a bypass humidifier?
I am replacing an old humidifier and would like to use the existing line from the cold water pipe to hook up to the new humidifier. Thanks.


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Old 11-14-2012, 09:36 AM   #2
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If the unit is mounted on the return side, hot water makes more sense.


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Old 11-14-2012, 10:02 AM   #3
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It should provide a higher level of evaporation but I can't tell you what % improvement it would be. Hopefully someone else here can. But this type of humidifier typically flows about 8 gallons per hour when activated (which for me in the coldest/dryest part of winter is whenever the furnace runs) so it would bump up your water heating costs significantly.
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Old 11-14-2012, 10:28 AM   #4
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I saw this asked somewhere,before and the answer was it could possibly encourage Legionairres Disease.
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Old 11-14-2012, 12:50 PM   #5
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One of the things I heard on this was using the hot water was better because as you heat the water up it tends to drop out base minerals into the Hot water tank, so you end up with less scale and sediment in your humidifier.
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Old 11-14-2012, 06:00 PM   #6
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Hot VS cold

Interesting concept, but I would think that if the rate of use would be so low it would not matter, because the water would cool before it hit the unit but it might keep the line from sweating if you use a copper water line. I have never had good results with those in furnace units. They cake up with efflorescence in no time and only work when the blower is on. I use a cabinet unit and man does it put out the humidity. About 6 gallons in a day.


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