Verify this installation

[ShaunCorbs]

I got that bit, but why does that seperation matter? ie why couldnt it be 12" between the tees?
Or am I asking questions that dont need asking

Would be too far apart to work efficiently

 

[doitmyself]

what is the relevance of the distance between tees? If you're pulling from one and putting it back in the other, what does the distance between them have to do with it?

It's all to do with the pressure difference between the flow and return ports. This needs to be as small as possible. If it's too big the water may prefer to travel straight past the port, depriving the rads of any flow..

The distance from ports to any bend (or Tee in a parallel system) in the primary circuit is to reduce turbulence in the flow.