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Discuss Gledhill light unvented cylinder imploded in the Plumbing Jobs | The Job-board area at PlumbersForums.net

Gledhill lite is called lite for a reason... the wall thickness of the cylinder is half the industry standard and deep within the manufacturers instructions they recommend fitting an anti vac valve.
Do not use a pump when draining down, the bigger the cylinder the higher the risk
 
It's not fitted right no, but neither of the mistakes on Installation would cause the vacuum created that has imploded the cylinder.

There's integral non return valves on both hot and cold draw offs on the combination valves.

One could argue that the absence of an anti-vacuum valve could be a cause... But it's not compulsory - only recommended to avoid scenarios exactly like his where the specified drain down procedure isn't followed.

Best to have a Lever valve on outlet and another on balanced cold and utilise those for tap changes etc.

It's a tough one as your not g3 your technically not competent to have had knowledge of this, but on the flip side, it is in the User instructions regarding correct drain down procedure. So the responsibility would still fall down to yourself.

Boilermate thermal stores behave exactly the same way if any attempt to bung them is tried.

Installation should still be corrected regarding the pipe layout/expansion vessel location. But as it stands the 2 components would still be operating in the same way as if they are now and wouldn't have contributed to this scenario.
 
Long & short of it is the unvented cylinder is not installed correctly (as per manufactures instructions) therefore not your problem! (especially as it has happened before & still not corrected).
Don't get involved, don't try to help (I no it is hard), if they push it simply pass it over to your Public Liability insurance company.
You do have insurance cover don't you??
 
Would not advise that “ostrich” attitude. The problem is a £1.5k fix. If you shun the Client and depend upon local work, word of mouth ( where you have no right of reply) may devastate your business.

A proposal to fix on a 50/50 basis may not be the bad deal it seems

Once you claim on a PLI, premiums rocket
 

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