Looking for advice or help

[medic6863]

I am repiping my radiators with pex al pex, manifolds.

2 zones one 4 rads and one 2 rads.

I will have the circulator pumps on the return.

The picture is sorta what I am going for

My questions are:

1. where should I install my expansion tank?
2. what else should I have/add into the piping?

if you can help me and if possible put on my picture and send.

thank you so much

 

[ShaunCorbs]

Where the return arrow is or where the watts fill is

 

[Lou]

How did you get on installing this?