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One thing to consider maybe is that Viessmann doesn't have installers in London. When I contacted them they could only give me one company in Cardiff.
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.
Velocio-
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.
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For boilers I would defer to someone like @sacredhart who actually knows this stuff but availability of people to install/maintain and availability of spare parts at short notice would rank pretty high in my selection criteria. Boxing in is fine imo so long as there is access for servicing etc. There are specifications for the amount of free space you need to have around the unit
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I haven't made a decision yet. My old Vaillant broke down 2 days into lockdown, I called their
service number to book a fixed price repair and they told me it's too old they don't repair it
or stock parts.
So I thought fuck it I get a Viessmann but they took ages to even reply to an email and then
I didn't want a massive operation in the kitchen while we are stuck at home.
Wasted 10 days trying to source a diaphragm for the Vaillant to try a repair myself, failed and
got a plumber from down the road to sort it out. Now I am thinking of just getting a new Vaillant through him when this pandemic is over. -
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.
I don't think reliability is anywhere near Vaillant though, although it's a while since I researched boilers. All the good installers seem to recommend Vaillant.
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The idea that a survey is looking at what is there and telling you what you know from the boiler you have installed that is working with out issue.
Bobbo
rhowe
sohi
Fox
lynx
One thing to consider maybe is that Viessmann doesn't have installers in London. When I contacted them they could only give me one company in Cardiff.