Vaillant system boiler (additional expn vessel?)

22 Sep 2008
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United Kingdom
Hi all,

Just looking at the Vaillant Ecotec 624 System boiler, it comes with an integral 10 litre expansion vessel.

The house is 4 bed 170 sq. metres, all radiators and 10/15/22mm pipework (no underfloor heating)

Typically, would you expect the system boiler itself to cope with expansion or would you be thinking of an additional stand-alone expansion vessel.

I'm thinking the integral vessel will be ok, but thought I'd ask.

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I normally add 18 litres expansion vessels where you have slightly larger system

A bigger expansion vessel will not cause any issues,just extra room for expansion ,plus there is not much in the price difference as 18 and 24 are very common sizes

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