I have a hydronic baseboard heating system in my house with three zone valves and one circulator pump. I have been running water in the system rather than antifreeze. Over the past seven years I have had two of the zone valves fail. Last winter I decided to change out all three valves in hopes that I wont have to touch deal with them again for a while, (Honeywell zone valves). I was careful not to use too much solder when installing them and used lead solder. One valve is already hanging up after being in use for 11 months. Our water is somewhat hard and I imagine that this is part of the problem. I’d rather stick with water rather than antifreeze because I don’t want to deal with getting rid of the antifreeze when I’m working on system. I’m doing extensive renovations to this house while were living in it and am moving some of the baseboard heaters. With three zones is it worth considering switching over to three circulator pumps with check valves instead of the zone valves that I currently have???
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