Paul Barker said:Yes you can use 110mm soil pipe as such. Area is pi r sq approx 95cm squared, so most likely OK. Bermuda available in different heat input, need to look at data badge, but probably OK with your plans.
Sorry to say engineers who designde bermuda were not very clever, hope it works at least a couple of years for you.
Oh my gosh. The Baxi Back boiler is one of the most reliable boilers of all times. I have fitted dozens of them. The have very little to go wrong on them. I service some that are well into their 20's. Ok so may not be most economical but save a fortue in repair bills.