I have a question about storing the extra heat generated during the day. What is the best commonly available medium to use? I have a basement and crawl space to put something in but nothing large. Would a 4ftx4ftx4ft concrete block, very well insulated and buried in the ground, with PEX tubing running through it work? Can't really have a
1-2k gallon tank anywhere. I understand the efficiencies probably wont be good but I want to make a system as cheaply as possible using common materials.
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