The expansion tank is installed to eliminate the back flow preventer that older homes have.There is no safety reason for it only to save the builder money and without a check valve on the supply to stop back flow of hot water into the cold supply it is worthless to the home owner.The temperature pressure relief valve is a safety device set at 210 degrees F and 150 psi. The pressure rating for cpvc is over 1,000 psi the fixtures are rated at 150 psi. Raising the temperature of water that is roughly 75 degrees to 120 degrees has barely any pressure difference. It's a water heater why would you heat hot water?
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