I've done this 100s of times. If you can put up with a 7ft basement, simply put the 2" of XPS foam on the existing floor with a 6x6 wire mesh on top and the tubing (make sure it is an O2 barrier tube) , then put min 3" of cement down. It is the easiest way.
If the height is an issue, then there is little option but to break up the concrete. Solar is a bigger subject with many options but the floor comes first as you need a place for any size tank....lol
Closed cell foam is great and one of the few things I would do to insulate a basement wall. Fiberglas is not recommended, at least by me.
Last edited by Mikesolar; 02-26-13 at 08:38 PM..
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