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connecting an indirect and an lp water heater together
So, I have a 70 gallon Vaughn indirect that is connected to my coal boiler this supplies my DHW in the winter. I have a LP water heater that I use in the summer. I need to get my water temperature down to 120 degrees as a requirement to be a Foster parent. I picked up a Caleffi tank mixing valve to take care of this.
Ok so I need to move the LP water heater (for more than just the convenience of plumbing together, the previous owner installed it with about a 10' horizontal run of vent pipe into the outside basement stair well) next to the indirect water heater, and plumb them to share the mixing valve. This in and of itself isn't a problem, but I was wondering if there was a way to plumb the 2 tanks together so that they feed each other. So in the winter the coal boiler would heat the indirect which would then flow into the LP water tank, and then in the summer the hot water from the LP tank would flow into the indirect tank, thus giving me a larger capacity of hot water, and preventing stagnation of the water in the tanks while one of them is not in use during summer or winter.
I had considered swapping out the LP unit to a heat pump unit, but all of them are to tall (only 58.5" of height) to fit in the basement where it needs to go (250 yr old stone farmhouse)