How those 10+ year warranties on boilers/combis differ from brand to brand? - Is there any small prints or catches which we have to be careful about it like "exceptions" and "conditions" - Are we tied up with certain premium service providers for annual check and maintenance? Or is there any offer which includes these as well? - Does "smart home" additions in the system like motorized zone valves/manifolts effects the warranty in anyway? What is your general experience and advice about the boiler warranties ?