All closed-loop hydronic systems require an air space to absorb the increased volume of water as it warms during system operation. In most hydronic systems, this task is handled by an expansion tank. In most modern hydronic systems, it’s handled by a diaphragm-type expansion tank.
The Watts Water Technologies family rolled out the proverbial red carpet in June as the company officially cut the ribbon on its new 30,000-sq.-ft. lead-free plumbing products foundry in Franklin, N.H.