Quote:
Originally Posted by HiHoSteveO
Do a search here for "Expansion tank" and you will find much discussion on this problem.
Evidently the valves pop out because of high water pressure in the system. This is caused by a faulty expansion tank which is located usually above the water heater. (look for the small upside down tank)
This is a plumbers job to fix.
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I don't know if your problem is caused by the expansion tank. But, if you don't have an expansion tank, or if you have a defective one, you should get it fixed or get one installed. If the water heater is 10 years old, you may want to have it replaced. Some plumbers will install a new water heater, and not provide the expansion tank, especially if there was not one installed previously. But, I would never allow a plumber to install a new water heater without an expansion tank to prevent excessive water pressure in the house.