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I've fitted vaillants for over 20 years and apart from the hose issue they had a few years ago, I have had no more than a handful of faults.
All boilers are suceptable to non use, and no checking of inhibitor. As I always use inhibitor and always powerflush every boiler change, maybe that's the reason why so little amount of problems.

Or I might be just lucky!
 
Lucky, I've had a few railed gas valves. But that's Honeywell really.
 

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