Why wouldnt you service your boiler annually? And no manufacturer will honour a warranty if you dont have it serviced so whats your point? Why not talk specifics about Biasi than make sweeping statements. Dont tell me.....Worcester or Vaillant? yada yada yada...
Fitted 20 plus. Had three with main heat exchanger faults which was a known manufacturing fault. Engineer out quick , swopped, all ok. Been 3 years since first one went in. no other issues.
Been a heating engineer for 10 years and an electrician for 15 years and in my opinion boilers are generally much the same. I fit Biasi and have done for years. I have fitted and fixed many boilers of all make, size and type. The biggest difference is how well they were installed, commissioned...