Put a guage on an outside fosset. Take a nice hot shower, go watch gauge as heater heats water. Gauge climbs too high you need a expansion tank.
Expansion tank? Overpressure? Water heater explosion? (1 Viewer)
- Thread starter e9999
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No expansion tank no problems, never had a house that had one. 
Disclaimer: I am not a plumber, but I did replace my Dishwasher today
Disclaimer: I am not a plumber, but I did replace my Dishwasher today