Combi boiler - adding new bigger rads and pressure?

[phil5556]

Just a quick question please because I think I've read this somewhere but can't find it again.

With a combi boiler system, If swapping 3 single radiators to 3 double (effectively increasing the system capacity by 3 radiators worth) will the pressure vessel need repressurising?

Boiler has quite a variation in pressure between cold/hot and can't remember if it was already like it before changing the rads over.

Cheers

 

[PrenticeBoyofDerry]

The pressure vessel should hold it's own pressure, but you may need to check if it require recharging, this would need checking against the manufacturers instruction. Whilst CH is being demanded expect the pressure to increase on the boiler gauge.