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I went on job today. General contractor had steam "guru" move around steam radiators on remodel job and he couldn't figure out why one rad would stay ice cold. Turns out that the guru ran about 40 feet of 1" black horizontal pipe to the rad. To me this WAY too long for a runoff using 1" pipe. I am convinced that the steam is dying in the pipe due to its mixing with the condensate. There plain and simply isn't enough room in the pipe for the steam and condensate. That's the background. The rad is on the second floor.I told GC that he can run a hot water loop directly off the boiler for that rad.I have done this before following Dan,s instructions in "How come". I told him that he could use pex as long as he blends the the supply water and return water to insure that the water that hits the pex is never more then 200 degrees.However after thinking about some more I am having second thoughts. I am not confident that the pex joints would do an absolute job keeping air out of the loop(critical for any condensate loop above the water level). Any thoughts on the matter would be greatly appreciated. Are the pex joints tight enough? That is the question. The difference in price between using pex and copper is fairly large. Thanks again