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I was definatly considering PEX tubing.
As for all the other parts, they get complicated real fast.
I would like to do a system similar to the "Solar heating plan for any home" in the Dec2007/Jan2008 issue of Mother Earth News.
It is an "open" system using a 4000 gallon tank built from 2x4s, plywood, and rubber roofing.
I would use fairly simply thermostats/pump controls for the project. Unfortunately, I would have to use the bronze Taco pump, which costs 2 and half times more than the cast iron one.
The other upside to a simple heat source running to a big box of water to some PEX in the floor is: I could add other heat sources to the design easily - such as a couple solar panels.
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