I'm in the planning stage of adding storage to my system. I have a pressurized system and I'm planning on adding 500-1000 gallons of unpressurized storage. The reason for unpressurized storage is so I can build the tank in place in my basement. The problem I'm having is the cost in making a copper heat exchanger. I've seen some people make pex heat exchangers, but I don't want to go that route. My question is: could I just use a plate exchanger and a pump and circulate the water in my unpressurized storage tank. I have my system plumbed primary/secondary and the one side of the plate exchanger would be plumbed in the primary loop. The other side of the plate exchanger would be plumbed to my storage tank and a pump to circulate the water between the tank and heat exchanger. To me this would be cheaper then making a copper heat exchanger to put inside the tank. Is there anything bad I'm missing with a setup like this? What are the pros and cons.
Thanks
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