Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Which way to pump

I am installing a hot water boiler with a primary / secondary plumbing system. The boiler is plumbed as a secondary into the primary pipe. Should I install the pump for the boiler pumping into the return on the boiler or on the supply pipe into the primary pipe ?


  • hot_rod
    hot_rod Member Posts: 22,251
    pump into the boiler, away from the expansion tank connection. This assures the boiler sees the additional pump head when it starts.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream