Battersea explosion: Unvented cylinder?

[Alan 483256]

Is this the result of an unvented cylinder exploding?
i.e. gas not involved at all, just the pressure in the system?

Explosion ‘seriously’ damages house in Battersea

An explosion, believed to have been caused by pressure in a hot water cylinder, has seriously damaged one house and damaged another in Battersea.

www.yourlocalguardian.co.uk

 

[oldbutnotdead]

Could be. Or could be a vented system where the vent has got blocked.

 

[Hugh Jaleak]

Possibly an unvented cylinder that's not been installed correctly.