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.

radiators bottom-to-bottom or not

aji Member Posts: 3
I'm installing old(salvaged) radiators that were originaly piped across the bottom (gravity). Is it ok to pipe the rads this way when using a circulator or should I attempt to open the upper nipple to connect top-to-bottom? note:old victorian, ornate, matching pair, expensive, rusty rads.
I need to get maximum BTUs out of these things but I don't want to damage them.


  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928

    Bottom-bottom connections work fine.
  • Eric Johnson
    Eric Johnson Member Posts: 174
    pressure test

    Be sure to pressure test them before installation.
  • Big Ed
    Big Ed Member Posts: 1,117
    Beware of High Flow Rate

    Depend of system piping ,flow rate and size of radiator but it can go straight through . Rare but it can happen.You can plug up the next push nipple as a back up.
This discussion has been closed.