Reply To: Do I need an expansion tank?

The Tank Do I need an expansion tank? Reply To: Do I need an expansion tank?

#5375
energyexpert
Participant

Randy,

Without a check valve at the house you could backfeed back into the public water supply with the potential contamination problem. Since there are many ways to backfeed, the building code does not try to identify all backfeed possibilities only that it not occur; thus a check valve. And the check valve will build pressure via the water heater.

Water Heater Rescue

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