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I got my boiler installed. Now I am working over the temperature monitoring. Note that I am still NOT insulated, but this shows how the slab heat is working. It would also be more instructive if I had the outside temperature. I will add that in time. Here is a daily graph, followed by a weekly...

Here is a pic of my radiant boiler install done last week. 1200 sf shop, 9 kW boiler, 5 zones. Controlled with Crestron TSTAT and slab probe so I can set min/max slab temp and air temp.

I am getting set up to install PEX/insulation for a 4" radiant slab in a 30x40 (pole-barn) shop in the Pacific Northwest. I have a couple questions. Under slab insulation will be BarrierXT (3/4"). I know it may not be the best, but time/money and other factors all come into play. Q1: What is...