Just get the 111. Use a Viessmann trained installer to get the 10 yr warranty (£120) then all you have to do is have it serviced every year. You’re reading too much into it. Viessmann are great to deal with.
I have a Vitodens 300 system boiler, 13 yrs old. Yes I know parts are expensive but the thing hasn’t given me a bit of trouble and is as good as new.
Used to fit Vaillant ecomax and had one where the rubber hose went crusty and bulged after a couple of years. That boiler is probably 13 yrs old now. I still look after it but have only changed the hose twice since the first one and that was more precautionary than anything, the replacements have never gone bad like the original and the system hasn’t been drained or flushed since installation.
I have a Vitodens 300 system boiler, 13 yrs old. Yes I know parts are expensive but the thing hasn’t given me a bit of trouble and is as good as new.
Used to fit Vaillant ecomax and had one where the rubber hose went crusty and bulged after a couple of years. That boiler is probably 13 yrs old now. I still look after it but have only changed the hose twice since the first one and that was more precautionary than anything, the replacements have never gone bad like the original and the system hasn’t been drained or flushed since installation.
