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Here's a little diagram to make things clearer: http://solarexpert.com/dhwpic.html

The storage tank is essentially a 120 gallon single-element electric heater with two extra ports for the solar collector inlet and return. The tank will be at the same pressure as the rest of the plumbing. You could use this tank in a single-tank solar setup with the electric element as your...

Hi all, I'm getting ready to install a solar water heating system. It's a pretty typical install with a 120 gallon solar storage tank in line with my existing gas fired water heater. That way the gas heater will kick in when there's not enough sun. The 120 gallon storage tank will go...