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Discuss Do I need expansion vessels? in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

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Hi

Looking at getting a Worcester Bosch 4000 24kw system boiler and a 210L Ideal tank. A friend showed us their system and they had two expansion vessels, one for the hot water tank and one for the central heating. Thought I'd have a look into the technical side before speaking with plumber, just so I understand it.
Any thoughts?
Or just stop asking strangers on the internet and go straight to plumber? :)

Thanks
 
How many radiators have you got ?
 
I would add an extra 12l expansion
 
It's probably best to add another 10- 12 litre one it will take up the expansion across the system better . Kop
 
So do I need an expansion vessel (potentially) just for the cyclinder, or one for the central heating too?
I think the Worcester Bosch 4000 has some kind of expansion vessel built in too?
 
That’s for the central heating
 
Potentially you need a extra one for the heating and one for the unvented cylinder, a system boiler has a expansion vessel built in but often that's not enough if you have more than 7-8 radiators which you have examples below. Kop
 

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