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[shanez28]

Can someone tell me if I need a expansion tank on the domestic line. I have a 200 Mahoning with a built in coil to heat my water so I ran the return into my water heater using a Honeywell mixing valve ,but not sure if that's the  right way to do it .

[slimjim]

Yes, your domestic water when heated will expand the same as in a hydronic system, most folks simply use their hot water tank in the loop, that serves as the expansion tank.