Steve, the main reason I thought about 12V pumps is familiarity, have been using them for years and know them well. Also they are inexpensive I have several, I buy them at yard sales, the weak link on them is the pressure sender, not a prob with heat loops; to be able to switch them directly by thermostat is handy as well.
Will research pumps over the winter probably.
Envy your southern insolation, we hardly get enough solar to pay for itself this far north. With grid tie inverters becoming so inexpensive will likely not build a large battery bank.
Since I have virtually no experience with in floor heat, many of my ideas will be changed as the build time approaches, as ideas flow from this and other sources, my thinking becomes more flexible, and the design evolves.
Am carving an elephant here, so we just keep knocking off the bits that don't look like the elephant.
Tony.
|