In a closed loop hydronic system, some suitable means must be supplied to accommodate the expansion of water volume and the added pressure within the heating system when heated to normal operating temperatures. Specially designed ASME Code tanks are necessary for this application and should be rated to withstand system pressure and temperature. A wide range of tanks are available. The importance of purchasing the correct size and design of expansion/compression tank is very important.

GGS supplies a closed tank system which utilizes air pressure to control water volume with a bladder, and an open tank system. The open tank system uses a metal tank without a bladder, excess water flows into the tank and is pumped out when the system needs it.

Water glass fixtures or gauges are standard on Expansion/Compression tanks and tank mounted low water cut-offs are available.

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