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Hot water heater overflow pipe1/15/2024 ![]() ![]() Why should a tankless water heater have an isolator/service valve kit installed?.Does a water heater need a shut-off valve?.Why is the water heater older than the house?.What is required clearance for access and working space in front of an electric water heater?.What is the minimum clearance to doors and windows for an outdoor tankless gas water heater?.Is it alright to have a shut-off valve on both the hot and cold water pipes at a water heater?.Can you wire a 240-volt water heater with 120 volts?.How can I tell if a water heater is HUD-approved for mobile/manufactured homes?.Can you use a light switch for a water heater disconnect?. ![]() Is the minimum size water heater inlet pipe 1/2" or 3/4" according to the building code?.Where are gas water heaters not allowed to be installed?.Can a Temperature and Pressure Relief (TPR or T&P) valve be mounted to discharge horizontally?.Are water heaters required to be raised off the floor?.Here’s links to a collection of more blog posts about WATER HEATERS: Pipe materials that are rated for hot water include CPVC, copper, galvanized, and PEX.įor more specifics on the correct installation of TPR discharge piping, see our blog posts Can you use PEX as discharge pipe at water heater temperature and pressure relief (TPR) valve?and What are the code requirements for the discharge piping from a Temperature-Pressure Relief (TPR) valve at a water heater? This will cause the PVC pipe to first deform, and then collapse, which constricts the flow and defeats the purpose of allowing the overheated and over-pressurized water to flow quickly out of the tank and prevent a tank explosion. If the temperature and pressure relief (TPR) valve opens because the water heater is overheating, the water will be over 200º F. PVC pipe is not rated by the building code for use with hot water, so the installation shown above is wrong and unsafe. ![]()
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