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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.
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.