Thanks for all the tips.
Expansion tank thumped normally .... more hollow sound at top, more full at bottom.
Temperature is not set that high and we are not big consumers of hot water.
We tested the pressure relief valve yesterday and the drain. After sopping up the water, we'll see if any more leaks out of the long pipe. If so, may be time to call the plumber.
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Maryland (DC Suburbs) - first 51 years
The Villages - next 51 years
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