Low loss header. Which way?

[Chalked]

When installing low loss headers with multiple boilers I've connected two diferent ways.

1. Boilers linked into one common flow and return, with check valves fitted on the boiler . Most manufacturer kits are like this too.
2. Header with multiple flow and return connections ( depending on how many boilers) and dedicated flow and returns from boilers to header.

are there any pros and cons that I can't see? My thoughts are, better off without the check valves.

 

[ShaunCorbs]

Option 1 I fit but size commons to cope with total load etc and fit swing valves

Option 2 down side is when you have a few boilers the last flow connection could be 4" down from the top etc

 

[Last Plumber]

Swings and roundabouts.

I always use option 1 myself. I think it looks neater.
Less pipes. I know they increase in size as you go but I think it looks better than more pipe runs.

I suppose it depends on how many boilers too.

 

[Last Plumber]

A thought !
Not been thru this yet in my head.

What about shunt pumps.
Are they built in the boilers in this question or are you fitting externals ?

All this depends on, number of boilers and what size, pipe size, flow rates etc as you know already !

Or are you just asking a general question.
You know the type that springs into your head at 3A.M.
And stops you going back to sleep.