Have an NTI combi boiler (TRX 150). Is it more efficient to have the heat set for hydronic floor heat at 120 degrees or higher (140 or 150)? 3" slab, 1200 sq ft residential.
source https://hvac-talk.com/vbb/threads/2243675-Hydronic-floor-heat-most-efficient-temperature?goto=newpost
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