ICE
Oh Well
I didn't know this until today. Almost all pressure relief valves have a bypass back to the supply which was considered reliable to relieve excess pressure and therefor an expansion tank wasn't required. I now have a water heater company that installs an expansion tank whenever there is a pressure regulator.
608.2 Excessive Water Pressure. Where static water pressure in the water supply piping is exceeding eighty (80) pounds per square inch (552 kPa), an approved-type pressure regulator preceded by an adequate strainer shall be installed ...................... An approved expansion tank shall be installed in the cold water distribution piping downstream of each such regulator to prevent excessive pressure from developing due to thermal expansion.
608.2 Excessive Water Pressure. Where static water pressure in the water supply piping is exceeding eighty (80) pounds per square inch (552 kPa), an approved-type pressure regulator preceded by an adequate strainer shall be installed ...................... An approved expansion tank shall be installed in the cold water distribution piping downstream of each such regulator to prevent excessive pressure from developing due to thermal expansion.
Last edited by a moderator: