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Discuss Expansion Vessel Size in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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I had a boiler fitted over 3 yrs ago. It is a commercial boiler - 100kw. The installer fitted an expansion vessel which is about 20 litres.

We have about 33 double rad and 2 single rads on the system. Someone mentioned to me that the expansion vessel is way too samll as we constantly have to rpressurise the boiler.

Any thoughts on this?
 
Be keen to bottom out where the waters coming from.

Then need to size a new vessel.
 
Around 1l per rad rough quick guide so just for the rads 35l needed so I would put a 50l in
 

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