I have 2 50 Gal Bradford White gas water heaters. each has a 2.1 gal expansion tank on top. One of the expansion tanks started leaking. I know to use an expansion tank you measure the water pressure for your home find the appropriate tank and pressurize to that pressure and put it on the water heater. My question is, if I have two water heaters do I split the measured pressure and put that on the expansion tank or do I still pressurize to the full amount, in this case, I measured the pressure on the external faucet at 80 psi. Also, I am guessing you turn off the water heater and drain (flush) it out before replacing the expansion tank?
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