Baxi Combi 105e Expension Vessel - where do I get one ???

[paulkedwards]

I am installing a new Baxi 105e combi boiler and as the system has a one way valve to prevent backfeeding into the mains, the system requires an expension vessel in the cold feed to the boiler. The instructions recommend a Zilmet 160ml R 1/2 15bar unit. Where can I get one of these ?

Many thanks, Paul

 

[ChrisR]

BES.LTD.UK item 11355 shock arrestor, £10.16 + vat.
Yours'll be one of the 1 in 1000 installations which gets one!

 

[paulkedwards]

Hi Chris, is this component an operation eqivilent of the Zilmet? Thanks, Paul

 

[ChrisR]

It's a pressure vessel, same as any other, but it's the size which a few of the combi mfrs use. All it has to do is absorb the expansion of water in the system which gets heated, and trapped when you turn the hot tap off. Water expands only by 4% between 4C and 100C - so it ain't a heck of a lot.
Zilmet is just a make.

 

[paulkedwards]

Many thanks for your help Chris. One last thing, the instructions also possiby putting a pressure regulator valve in line to maintain a maximum water pressure of 8 bar. Is this a usual fitment to systems ?

 

[ChrisR]

Rare. Call your water supply company and ask what the supply pressure is in your postcode area. I've only once measured 8 bar - 3 bar is more common. Normal mortals can hold a thumb ona tap at about 2.5 bar, plumbers manage about 3.5 .

 

[paulkedwards]

Once again many thanks for your very quick replies. Time to go shopping now. Paul