Expansion tank Question

PipingQuestion

Can (or do you see a problem with) Tieing a HW system, and a closed loop condensor water system into the same expansion tank if the systems will be at the same glycol percentages, and pressures. The is a chance of the two systems to be runnning at the same time in the fall, and spring months. Whem sizing the expansion tank they would be both the same size.

Paul Pollets

Expansion tanks

Each system should have its own expansion tank. The (open) potable expansion tank uses different materials than a closed-loop (boiler) expansion tank. They cannot share a common tank because you would be mixing non-potable with potable. If you mean a "condensing boiler system", the closed loop system has it's own expansion tank. The tank(s) should be sized according to total system volume.