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Radiant Floor heats very slowly
I have an under floor (between the joists) radiant floor. It is 1/2 inch oxygen barrier pex on Joist Trak, 8” spacing. It’s 3/4” subfloor and basic oak flooring. The joist bays are insulated with reflective radiant barrier.
The house is single floor, 1200 sqft, modern, highly insulated. I have a one-zone system built by HydroSmart, utilizing a Thermolec 11kw electric modulating (37,532 BTU) boiler with outdoor reset, running to a 6-loop Bluefin manifold. The loops are all 275-290 feet and each loop is set at a flow rate of .5. It runs beautifully. It is quiet and keeps my house extremely comfortable. The pressure at the boiler is a constant 15psi, per the manufacturer.
My question is this: if I am going to be away for a few days, I set the “away” feature of my TekmarTstat. This sets the temperature at 62 degrees. About an hour or two before I return home, I use the Tekmar app to turn the heat back to its normal setting at 66 degrees. But it takes much longer than an hour or two to “move the dial” 4 degrees. Is that normal?
The water is leaving the Thermolec at around 100 degrees and returning at around 80 degrees.
The concept of “turning the heat up” is very different than when I had forced air or hydronic radiators. If people in my house are chilly I cannot simply turn up the Tstat and expect it to be warmer within 30 minutes or so. I want to know if this just means that I must adapt my thinking and planning or if something is wrong.