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How hot should water be in Radiant pipes?
Under floor system. Insulated from basement. PEX tubing stapled to joists, not to wood sub-floor. Water temp in the pipes varies with outside temp from less than100 to 165. That is the temp as it leaves the boiler, temp is likely lower when it hits the pex tubing as it flows through anywhere from 20 to 40 feet of copper tubing to get to the manifolds that feed the pex tubing. The high end is when the outside temp is below zero. I can grip and hold the pex tubing. at least for a bit, at it's hottest. Normally it is less than120. Is that too hot? Thanks.
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