Does the water heater require an expansion tank?

An expansion tank is required on the supply line coming into the tank to reduce the tank stress which will shorten the tank's useful life. An alternative to the expansion tank is an approved pressure relief valve assembly. These devices are required on closed systems, which is public water. Expansion tanks or expansion valves are not required on wells.


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1. Do I need a drip pan under my water heater?
2. Do I need a permit to replace my old water heater?
3. Do I need to provide any protection for a water heater in the garage?
4. Does the water heater require an expansion tank?