Rustic you hit the nail square on the head, they are rubbish, I have been in the heating/solar game for more than 30 years and run a 25 year old Camray oil boiler, ALL your modern crap is just that, it might be efficient but at what cost, to my way of thinking you want above all reliability, you do not get this with as Rustic says all the electronics inside the boiler casing, do not get me wrong I had one of the first condensing boilers on the market way back in 1988 but it did not contain all the electronics we now have, and over the years have fitted hundreds, mainly Glow Worm, then I tried an Ideal, yea right, condensate pan made of stainless (very good) but seams were spot welded with silicon mastic bead placed after, (not good) leaked condensate everywhere, then tried Keston had two in quick succession, took them both out and sent them back, went back to Glow Worm, funny enough just seen an old customer with one today, boiler is fine he just set the programmer to start at 6pm instead of 6 am and wondered why the rest of the program would not run, since semi retirement have fitted more than half a dozen Logics with no problems heard, more recently fitted an Ariston multipoint, interestingly not condensing, absolute rubbish, so cant win them all, Rick