Quote:
Originally Posted by TVJim
You DO NEED the expansion tank, there is a check valve in the line between your house and the street. When the water heater cycles the expansion tank suppresses the pressure of the expanding heated water.
Have a plumber change out the expansion tank and replace all the shutoff valves while they are there.
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This is true unless you have a tankless water heater, According to the 2018 International Plumbing Code (IPC) section 608.3, tankless water heaters do not require a thermal expansion tank when no water storage device is used. However, there are a few exceptions. If a tankless water heater is being used in conjunction with a tank water heater or a recirculating system that utilizes a storage tank in a closed plumbing system, an expansion tank is required to control thermal expansion.This does not apply directly to most homeowners who have a tankless water heater system.