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Thank you, Jim. Yet another reason to cover the pex! I was thinking of stitching some FR fabric and velcro tubes. And you've given me the simplest description of the difference in size - now it clicks that of course pex has a smaller ID! The radiators I'm looking at buying are wall mount (with...

Thank you, Dana. My new boiler is 28k-140k - I was trying not to go too big, even taking into account the lack of wall insulation. The windows were all replaced some years back with double-glazed vinyl. I'm in SW Ohio, which is balmy compared to most of the rest of the state. I'm thinking...

Hoping to get some advice regarding connecting new (steel, not cast iron) radiators to existing piping. Contemplating oxygen-barrier, up to 200F pex. Unsure of what size PEX. Unsure if it is even a good idea. My home: built 1941, one story with basement, a bit over 1000 sq ft, closed loop hot...