Looking for some input or help

[medic6863]

I am replacing the piping to my radiators with pex al pex. They will run into manifolds and the circulator pumps will be on return.
I attached a picture of sorta the idea.

My questions are.
Where should the expansion tank be located?

And is there anything missing i should put in and location.

If possible draw it on my pic and submit back.

Thank you so much.

 

[Fitter30]

Boiler brand and model? Two pumps for zone control?

 

[Sponsor]

 

[medic6863]

Boiler brand and model? Two pumps for zone control?

I will look like this but not as big. Each return has a pump running off the zone control