Hydronic baseboard heat question

mga

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Oct 1, 2018
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I have a 95% slant fin boiler, and the house is zones into two sections.

I recently remodeled the bathroom and if I put any baseboard heat elements in there it'll look terrible, and be in the way, So, what I want to do is run PEX line under the flooring which will be tied into the existing 3/4" copper pipes. The flooring is 3/4" plywood, covered with 1/2" concrete board and tiled over with ceramic tiles.

Some people that I have talked to said I can't do that because it will warp the flooring, others have said it will get too hot. I have set the high temp on the boiler to not go over 160 degrees. So, why can't I do this? If I install the PEX 1/2" away from the sub floor, what would the problem be? Or, if I run thin reflective insulation first then the PEX against that, would that work?

I have to get heat in there soon and I don't want to run a separate pump and lines just for that room.

am I OK to do what I want to do in that room?
 

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