[bombela]

The house is a stick framing atop a perimeter foundation, with few posts making a crawl space. You can almost sit down. It took a week to install loops of 1/2 (16mm) PEX between the joists supporting the floor. The pipes go through holes in the joist and blocking, and cross at the beginning of every bay to make up every loop. The PEX is held up by aluminum heat plates that are simply stapled. Theost annoying part of the job was to cut all protiding nails. The took few days prior the piping. There is something like 400m of pipes. Split into multiple circuits. Aligned at room boundaries and adjusted to have similar length for homogenous pressure drop. All of that is an open loop with the water heater. A pump, a thermostat and few check valves supply the manifold that distribute the hot water under the floor.

[duckmysick]

Awesome, thanks. The loop design looks simple, which is encouraging. It's true that the most annoying parts are usually the secondary tasks that can't be ignored either way.

The joists sure help. In my case the floor is either tiles or wood panels laying on top of poured concrete.