How to troubleshoot, repair and replace a Honeywell Zone Valve.
On a hot water heating system. The heating system is split up into separate zones, heating different parts of your home, basically for every thermostat you have you will have a zone valve. (if your system uses zone valves some systems have a separate circulator pump for each zone) So if you have three thermostats in you home you should have three zone valves on you boiler.
If you have a garage unit heater that runs off your boiler then you will have
four (in some areas the unit heater zone is not controlled with a zone valve and
the water is allowed to flow freely) and if you have an indirect water heater
for your domestic hot water you will have 5.
There are four major zone valve
manufactures. Taco, Honeywell, White Rogers, And Erie. There are others out
there, but I can't remember the last time I saw one that was not
manufactured by these companies.