Expansion tank? Overpressure? Water heater explosion?

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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.
 
No expansion tank no problems, never had a house that had one. :meh:

Disclaimer: I am not a plumber, but I did replace my Dishwasher today :)
 

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