Fixtures & Water HeatersQuestion 218 of 360
A thermal expansion tank installed on a water heater system must be:
a.supported so its weight is not carried by the connecting piping
b.filled completely with water
c.installed only on the hot outlet
d.left unpressurized
Explanation
An expansion tank, especially when full of water, is heavy and must be independently supported so its weight does not stress or break the piping. The air side is precharged to match system pressure. Proper support and precharge let the tank absorb thermal expansion reliably.
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