In another thread, I inquired about whether I should install a hardwood floor in the bathroom. This thread is to address the issue of a sweating toilet to prevent damage to the hardwood. The toilet I have is insulated but still sweats. I can access the plumbing from the basement and I was wondering if I should change the routing of the copper pipe to allow some "pre-warming" of the water. The water supply for the toilet is very near the water source for the house so I get very cold water to the toilet. Is there some kind of pre-warming blatter that can be installed before the toilet to let the water warm up a bit using the ambient room temperature? How about if I go from 1/2" copper to say 3/4" or 1" and run it between the floor joists for 8" and back for another 8', then back to 1/2" copper, then to the toilet? I know that this will not equal the volume of water the toilet needs but it may be enough to stop the sweating - unless the toilet is flushed twice in a very short period of time.
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