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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
rhowe
Velocio
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.