I am unsure about what kind of devices are needed to be able to take heat from a solar thermal (glycol closed-loop) setup, to heat domestic water in a 40-gallon storage tank up to 120F, and then have the solar thermal heat redirected into a 400-gallon storage tank. What contraption would you use to detect when the temp has reached 120f in the primary tank, and divert that heat to the larger secondary tank?
The 40-gallon tank is a System 2000/ Energy Kinetics with a small external plate heat exchanger. The heat exchanger in the 400-gallon tank is a coil of 3/4" copper., and the heat from that tank is harvested to preheat the domestic hot water as well as radiant space heating via pex tubing. I don't have the solar system up and running yet. I'd like to integrate that primary tank so that I've got 40 gallons of 120F water at the ready, but I don't want it to get hotter than that because it needs to run through my on-demand propane water heater, and it won't accept water over that temp, and I don't want the risk of scalding.
Diagrams and links to components needed would be much appreciated. thanks.photo (14).JPG
The 40-gallon tank is a System 2000/ Energy Kinetics with a small external plate heat exchanger. The heat exchanger in the 400-gallon tank is a coil of 3/4" copper., and the heat from that tank is harvested to preheat the domestic hot water as well as radiant space heating via pex tubing. I don't have the solar system up and running yet. I'd like to integrate that primary tank so that I've got 40 gallons of 120F water at the ready, but I don't want it to get hotter than that because it needs to run through my on-demand propane water heater, and it won't accept water over that temp, and I don't want the risk of scalding.
Diagrams and links to components needed would be much appreciated. thanks.photo (14).JPG
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