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I stopped fitting them about 3 months ago, I and a couple of other installers had to threaten them with the HSE and a riddor report on one of the burners just to get them to provide the parts which were in guarantee!! We were told 'off the record' not to bother fitting any of the 100 models...

I am an approved installer for Viessmann and can offer a 5 year guarantee on fitting these boilers. I have been fitting viessman 100 and 200's exclusively for the last 2 and a half years and have fitted over 40, you want a list of the faults? 1. Faulty ignition blocks (giving F4 faults)...