santon unvented cylinder/hot water supply

[pips]

Installed 3 yrs ago (in apts) as part of newbuild development. Builder liquidated shortly after; left no details on this behind. How frequent is this supposed to be checked or serviced? Can any plumber/electrician do, or else who is certified to do so? Would appreciate any advice - Thank you.

 

[Dan]

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[snowhead]

Unvented cylinder = G3 Building regs and requires a plumber / heating engineer with G3 unvented qualification to check it anually.

 

[pips]

Many thanks for response.