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Can it be possible for 2 homes on the side of the street, on the same cul-de-sac, 3 houses apart from each other, to have their water heater press. relief valve go off approx. the same time? My neighbor call me to ask about water from her tank's pres. relief valve..I looked at it, water had stopped by the time I got there. everything else looked ok..when I r/t to my own home, i noticed h20 in my garage and low and behold, my tank had released lots of water also!!! Could this be something to do w/ the water pressure from the city or gas pressure (both tanks are gas heated). This has never happende befor to my tank in the last 5 years. both tanks are less than 8 years old. What do you think?
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It sounds like your neighborhood had a momentary spike in water pressure. Given that this is the only instance of this happening in 5 yrs it is not something you need to be alarmed about at this time, however, if it were to happen again you may want to call your water company and inform them of the problem. -
If you have pressure regulating valves on your house, it should prevent the city spike from causing problems. This might indicate that your PRV is defective. This also reinforces the point that in most cases there should be an expansion tank at the cold water inlet to the WH. Most manufacturers recommend this.Comment
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If the city water pressure is high enough to require a Pressure Regulating Valve (exceeds 85psi) on the main the plumbing code requires an expansion tank on the water heater cold water line.
Ref.
International Residential Code 2903.4
Uniform Plumbing Code 608.3Comment
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