Good morning to all!
I have a question on pump locations.
My system has three existing zones an they are on the return line.
Air scoop and expansion tank is on the supply side as it should be.
My question is can I add another zone putting that zone / circulator on the supply line leaving the others where they are now or do they all need to be located on the same side.
Mty research so far leads me to belive that with a secondary loop for a radiant zone the primary loop circulator is on the supply side.
My intent is to add a radiant heat zone with a secondary loop.
Any thoughts?
Thanks in advance!

it will be fine locating the new circulator on the supply pipe. put isolation flanges on both sides of the circulator for future servicing. also, use a circulator with a built-in flow check. it has IFC in the model name..

Outstanding! Thank you for that info!



Edited 1 times.

What type of radiant loop?

Hi Paul,

I am thinking about installing in floor radiant in a first floor bathroom and entrance hall. possibly the kitchen as well. I would like to do three zones so as to keep the rooms at a certain set temp. Havent done a heat loss as yet but the square foot area of all three is minimum. A total of about 336 sq ft.
Boiler has three zones now all with the circulators on the return lines. The pumps are on a manifold coming off the boiler at the loweer section and the supply lines are being feed from the supply side at the highest point coming from the air scoop (close t's).The system is a Closed system non condensing boiler.
Every thing I research about radiant piping shows the circulators at the supply side.
I am looking at several different methods but not sure which way to go. A. Pump with manifoild at the wall closest to all circuts Primary pump to srcondary pump / mixing close to boiler them to muli manifold at closest to all circuts? ect. ect.
Also looking at the RMB-1 mixing block.
Its all fun! GRRRRRR
Thanks for asking the question!

Lots of things to learn...all interesting stuff. What you're describing would not be primary/secondary piping. The tee's on an anler setup although they may be closely spaced will do nothing to prevent one pump from interfering(possibly) with another. The radiant mixing block is nice, maybe a little too pricey though. There's less expensive ways to go. The application, and the floor covering will determine the max temp. If you pick your existing system apart, you'll probably find out that most of it is wrong.

Paul, I have to agree with you on that last part. It was done a few years back now but most schematics I look at now are not done the way mine has been done.
Thats why I am thinking about re doing the circulators to the supply side and following a more modern designed piping system...
Temperature here is still warm so I have a little time left before fall really sets in!
I really like that RMB-1 block though. simple hook up and its done...(so I assume)