alex
Maybe all of your valves were from a bad lot. Typically Honeywell zone valves will last for 20 years or more with no maintenance. Maybe they were overheated during installation? Also very high operation temperatures (above 200 F ) might shorten their life. One more problem that would shorten their life would be excessive oxygen in the water. This would occur if you have a leak in the system and are continually making up water. Also a very low or high ph or very hard water might shorten valve life. Did you try going back to the supplier or Honeywell directly with your problem. Good luck. Wayne
