circulator sizing for wood boiler

Marc K.

I have a customer who purchased an indoor ewood boiler (Wood Master Flex Fuel, looks very well made), that comes with a buffer tank.  I suggested a hx on the system side, on the outlet of the buffer tank.  Manufacturer says not necessary.  I need help with sizing a circulator for what is, essentially, an open system.  I know my load, to calculate gpm, but not sure how to go about calculating head.  Would appreciate any help.

(Manufacturer has specified circ. between boiler and buffer tank, a taco 2400-20B)

Robert_25

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The brochure for that boiler shows an expansion tank in the diagram...are you sure it is an open system?



That seems like a lot of circulator just to pump water through a solid fuel boiler and a storage tank, but maybe there is something I'm missing inside the boiler. When in doubt, follow the directions....or call the manufacturer and see what their reasoning is.