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There really are no drawbacks to it, at all. It keeps moisture in the air and is very effecient. The heat is not what caused the mold, although it didn't help in getting rid of it. I'm sorry if I gave that impression

Where we live there is a very high humidity factor and we've had a horrendous amount of rain since September, nothing is drying and the ground is thoroughly saturated.

There was a tremendous amount of mold build up on the outside of the house and my husband went through 4 gallons of bleach getting rid of it. It actually looks like he put a new coat of paint on it. So between the exterior mold, the high humidity, all the rain, the dampness under the vinyl tile in the bathroom and the hot water heating system - we had a major problem.

Actually there is one drawback to this type of heating system - you most likely would have to buy a much older house or have one custom built. Our house was built in 1945 but the heating system was installed later - it's an old farmhouse that used to beheated with a woodstove. I think the baseboard hot water systems became popular in the early 60s.