I have a tankLESS water heater system in my house. I have been having trouble with my pressure relief valve leaking every time the boiler turns off after firing to heat the water. I had my HVAC repair man over twice and he replaced the valve both times and it still leaks. Any ideas at what might be causing this? I had an idea it could be air in the system somewhere, or a water-logged expansion tank. I have 5 zone hot-water baseboard heat.
http://www.theplumbing.net
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