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I know of at least 1 Viessmann (possibly 2 but the other was in the verge of retirement when I last worked with him ~ 8 months ago) approved installers in London. The one that is definitely still working only deals with Viessmann so not sure why they are saying there is none in London, will have to flag this with him next time I see him. Can dig out contact details if interested.
Bobbo
sohi
Good call... did you go for it anyway?
I asked a heating engineer what he thought, he concurred that installation is hard (extra training he hasn't done) but that maintenance is a dream.
He recommended that if I'm looking at that level of quality that I investigate Worcester Bosch as there were more installers, efficiency is nearly equivalent. He suggested something like this https://www.worcester-bosch.co.uk/products/boilers/lifestyle
Though most of what he told me was not to change the power of it without doing a full site survey as the gas run might not support a higher rating anyway and then it would be less efficient. So his main advice was: Do nothing and make no choices until you've had a full site survey.
So it's not like I'm making any decision for a long time.