Solar water heating
Went on the solar tour last weekend and saw a really neat design.
A guy had active water roof mounted solar panels that were run through PEX tubing into a bed of sand under the foundation slab. He had 2ft of sand that the PEX was turning it into a large thermal mass.
My question is this;
We are building a new home on a concrete slab that will already have PEX tubing in the concrete for radiate heat that will run off a Geothermal unit.
Will I be able to connect the solar unit into the same PEX tubing that will be used by the Geo unit so that the Geo unit only runs when the solar can't keep up?
I was also thinking about running PEX under the garage to use strictly w/ the solar unit to help warm the garage in the winter.
Which would work better, having the large 2ft sand bed or just running the PEX in the concrete like the rest of the house?