Expansion Vessel Needed?

[Hessles]

I've got a pressure reducing valve with an integrated check valve and pressure relief valve which has a connection point for an expansion vessel but the plumber hasn't fitted one.

There is about 2m of plastic pipe between this and the new storage combi.

Will the pressure relief valve save the pipe work?

Should I ask him to fit a mini vessel?

 

[simond]

Most storage combis (in the absence of any info) require a small expansion vessel inserted in the incoming water main, especially if there is a non return valve within a short distance of the boiler.

As your pressure reducing valve is effectively a non return valve, this is a problem and may, ironically, damage the boiler.

NB: Plumbers do kharzis, basins,etc; heating engineers fit boilers.