circulator size


Old 08-07-11, 01:32 PM
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Join Date: Aug 2011
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circulator size

I would like to know what size circulator pump I need. I have a buderus G115 oil fired boiler feeding 4 zones plus domestic hot water each zone has it's own Taco 007 pump and I want to supplement it by tying in a new Harmon 160 wood/coal boiler I already have 1-1/4" and 1" valves and fittings on the buderus manifolds. They will be right next to each other so probably know more than ten feet of pipe. Will a Taco 007 be big enough to go between boilers or do I need something bigger.

Last edited by Glenngresko; 08-07-11 at 02:02 PM.
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Old 08-11-11, 09:07 AM
Join Date: May 2011
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If you simply connect the two boilers in parallel, half of the flow needed by the circulators will come from each boiler. That 's half hot, half cold water. More than a circulator is needed. A check valve will keep the cold water flow from going through the inactive boiler. Worst case will call for a pump with the capacity of all the 007's taken together; but that will be reduced by the flow resistance of the loops (head ft equivalent of the pipe length and fittings). Hope this helps.

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