1975gt750 wrote:i may have a bigger problem. after looking at the way the system was plumbed i may have to add some zone valves. the reason why is if zone 1 comes on and the circulator between the two boilers come on it may pull water through the other three zones when heat is not called for. do you think the taco 007 have enough to pull the water from the coal boiler to the oil burner and then through the house and back to the coal boiler with out using the circulator in between the two boilers?
a greatly appreciate all the help
Those pics solved my questions -- thank-you
no the way you have the coal boiler on the return -- is the typical close spaced tee method of boiler isolation -- PERFECT it will not "pull" as you describe above
as for the taco pump size -- Irrelevant due to coal boiler being isolated by the piping - if you want a "dump zone" you will have to due it with controls -- not further plumbing