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I do agree, from an engineers point of view they are pish to work on, difficult to change parts and full of plastic. People rave about them but they aren't good imo.
We fit baxi/main stuff and my dad has done for 20 odd years. Yeah they have had shit models but the duotec the previous model was fantastic. The new models are very similar but smaller and a bit lighter from an installer pov but very similar to the previous model.
Avoid vokera and a few others, but every engineer has there favs. You want something thats reliable and if it does break down you have a decent engineer that will come and fix it(I know that a lot of boilers now have long warranty's but installer is usually the first call)
Well in ours there is a special piece of moulded polystyrene upgrade to make leaking water run over one of the more expensive electrical components, to reduce the cost of repair.
There is something both beautiful and hideous about a manufacturer pricing up fixing a fundamental design flaw, and then realising its better VFM to design a little cover instead.
On balance I've not been very impressed and would probably look elsewhere.