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Winkler, Manitoba Canada | I would say that the plumber somewhat misrepresented antifreeze in a floor heat system. In a well designed system, the user will not notice any degradation of the heating performance, when comparing water or antifreeze in the system. Antifreeze will however increase the head pressure/reduce the flow in the system somewhat, depending on the strength of the mixture. In a poorly designed system, this head pressure increase may result in poor circulation and heat transfer. The heat capacity of a solution of a water/propylene glycol commonly used for hydronic heating systems also has less capacity to carry heat than water. All factors to consider, but not a problem if accounted for.
Edited by WTW 6/5/2015 16:20
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Sharing hot water with shop radiant floor heat?
