GRIFFINW wrote:Hello Axemen,
Every summer I work on some upgrades to my to my beloved 130 and system.
Some of which is redoing work that I should have perhaps thought through
a bit more at the time. Using some old pictures while building up my Axeman,
I put the circulator on the return side, like in the picture. Of course everything on a
new installation is on the supply side. I’m using a Grundfos UP26-64 3 speed and
about a 100 foot primary loop. Is it worth changing it around for some added efficiency?
As always I appreciate your valued advise.
Return side pumping and supply side pumping have nothing to do with efficiency and everything to do with system design.
Supply side pumping has had a lot written about it but is easily and frequently mis-applied. The location of the air separator, system loads, pump and boiler are all important to consider to achieve proper air separation, not higher efficiency. Remember, we are running coal boilers, not some high tech funky condensing boiler.
If it works fine, don't mess with it. Return side pumping can work fine.