Expansion vessel

[Aiplumbinggas]

If there is an unvented cylinder being installed in the loft,
System boiler downstairs, how would you decide what size expansion vessel to put on the heating side and how will you configure the Pipework for heating expansion vessel in the loft. As there will be an expansion vessel in the boiler so does it need another one.
And how would you decide if any pumps are needed as there is a pump already in the boiler.
Thanks

 

[ShaunCorbs]

Simply 1l per 1 rad unless there massive rads and a lot

Oversizing isn’t a bad point either it’s best

As for pump need to know a bit more about the sys how many rads standard house etc

 

[Scott_D]

Is this a system you are installing or having installed?

 

[Aiplumbinggas]

Not installing but trying to understand for future references.
Let’s say it has 15 radiators, 3 floors.

 

[ShaunCorbs]

So 20l of expansion

And 15-60 would do a standard width 2 up 2 down with loft conversion (3 floors)

 

[Aiplumbinggas]

So 20l of expansion

And 15-60 would do a standard width 2 up 2 down with loft conversion (3 floors)

What would be the best location for pump ?

 

[ShaunCorbs]

What would be the best location for pump ?

TBH I would normally try and put it middle floor with the cylinder etc

 

[Harvest Fields]

Open forum mate. Just incase you didn’t know.