And have you also seen some that need replacing in less than ten years?
None!! They can all be fixed. Those that were economically not worth keeping were always installed incorrectly - and that applies to all boilers not just combis. A combi is a system boiler with an added water section - that's all. They share many of the same components: heat exchanger, burner, controls, etc.
what a load of rubbish! hav ya even got any experience of workin on any boiler?
It is clear you haven't a clue about how boilers are designed - or anything else for that matter.
course not, i work for bg and more often than not visit 8 breakdowns a day! how would i no anything about how long a boiler would last how they work or what is likely to go wrong with um..
get back on google ya idiot! n ya didnt answer me question, what actual experience do you have???