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Expansion Tanks & Air Vents

Air elimination is critical in radiant floor heating systems. A 1/4 in. bubble in 1/2 in tubing can cause a significant flow restriction. So getting a good air eliminator is a key component in the heater installation.

Sizing an Expansion Tank
You need an expansion tank if you have a closed system. A closed system maintains the same fluid in it at all times. When the water is heated and expands, it needs a place to go, and the expansion tank fills that role. In contrast, an open system has water entering it via the municipal supply and water leaving it via plumbing fixtures. An open boiler (such as an outdoor, non-pressurized wood furnace) is also an open system. If you have a backflow preventer, this creates a closed system and you will need a tank even if you have a direct system.

To size your expansion tank‚ you first need to know how much water is in the system. See below:

Total Length of 1/2 in.pipe x .00921 = ______ Gallons
Total Length of 3/4 in.pipe x .01837 = ______ Gallons
Total Length of 1 in.pipe x .03025 = ______ Gallons
Size of water heater or boiler = ______ Gallons
Total System Volume = _____ X .088
Minimum Expansion Tank Size = _____ Gallons (round up)

Add anti-freeze to your heating system to protect against pipe bursting or for operation at temperatures below freezing like in snow melting systems. Don't forget a refractometer for measuring anti-freeze concentrations.

Contact us for product selection. We are glad to help.


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