The worst boiler manufacturer in the world will forget more than I have even learnt for sure. Being an experienced boiler repair engineer, I have been always amazed by other fellow engineers’ saying “That is a shit boiler!” etc.
A boiler is a boler and it is a boiler! Their principles are almost the same. Understand them, and master them, it is the job of all boiler repair engineers.
But once a particular boiler model is in product it will be costly to change any parts for weak points in design and production and all boiler manufacturers will try their best to avoid recalls. They just leave this boiler model as it is, and sell spares for it, to continue making money out of this boiler.
So some boilers are good, some boilers aren’t. We are just giving out our experience here.
Baxi / Potterton / Main boilers
Gledhill Thermal Stores
Vaillant / Glow worm boilers
Worcester Bosch Boilers