Boiler with Closely Spaced Tee - main pump on in or out side?

Jeff Lewis

I have a Munchkin Boiler powering a radiant floor setup. Love it!



The setup runs a closely spaced tee coming off the boiler. When I installed it, the manufacturer's spec's said to put the main pump on the side coming IN to [corrected] the boiler. A pro installer recently told me I should have put it on the side going OUT of [corrected] the boiler.



Does it matter?



- Jeff

superdave

pumping

Yes, it is always best to pump through the main heat-exchanger on a condensing boiler. I am a huge fan of the Caleffi hydro separators (548).

superdave

pumping

Yes, it is always best to pump through the main heat-exchanger on a condensing boiler. I am a huge fan of the Caleffi hydro separators (548).

Terry O

I'm not sure how....

your manual showed piping the boiler pump or if you may have misread it, but the "boiler" pump is typically installed on the boiler "return" pumping away from the expansion tank and against the system pressure drop which in this case in the heat exchanger.



 Here is a link for the Munchkin manual from their website:

http://www.munchkinboiler.net/uploads/MunchkinRevision2Installation.pdf



Checkout part 5 for piping details. Hope this is a help.

Jeff Lewis

correction - pumping on "in" side

Sorry, my original post was written backwards. My pump is on the "IN" side per Munchkin's specs. The advice I got was to have it on the "OUT" side.



- Jeff

Alan (California Radiant) Forbes

Leave it

where it is.  You have piped it correctly, my friend.