Ok not a heating engineer but I have just bought a logic + as it was recommended to me by plumber friend, a mate of mine is doing the dame from a different recommendation.
Do yourself a favour and spend the few extra quid and get the + as this has a further 3 years warranty.
That's my 2 pence worth
Please don't take this as a criticism but I would adjust your post title to say something like "Help with Boiler choice", you may get more people looking and replying to you
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