Unvented Expansion Vessel Replacement - what else needs changing

[Topslice]

Potable water unvented expansion vessel needs replacing - water is coming
down the tundish.
What else needs to be replaced.
Does the enginneer need a G3 unvented certificate to do this work
and what are the consequences if he does not have one

 

[gmartine]

Yes, a G3 qualified repair/service record validates cylinder warranty and home insurance.

 

[Topslice]

the cylinder is past warranty period.
how would insurance company know work had been done

 

[gmartine]

You should have a Benchmark service record or equivalent Conmmisioning Cert service record, call your home insurance company and see what they say.

 

[fowlerboi]

The consequence could be imploding your cylinder and flooding your house if you don't know how to safely isolate and drain the cylinder to change the expansion

If you don't fit the right thing or do it wrongly or don't know how to check its working properly then you may blow your cylinder up and potentially the top floor of your house.

If your budget is less than the cost of a qualified engineer to fix it and you value yours and your families life I would advise you resort to boiling the kettle and bathing with a bucket and a sponge.