There are so many different makes and models of boilers and even with every single manual to hand you still may need to speak to the manufacturer as they dont put everything in the manuals. To try and stop homeowners fiddling.
Personally I dont come across many 10 year old boilers that need replacing but sometimes it happens, my way of looking at it is if you have had 10 years trouble free heating and hotwater it owes you nothing so I would look at replacing instead and get 7-10 years warranty on a new boiler have it serviced every year and start the cycle again.
The main thing that makes boilers beyond repair is the cost of spares. Manufacturers are having to make money back to cover the long warranties so they put that on spares.
You could get a second opinion and if it is full of dirt then you could get it flushed and filter fitted which could get a few more years out of it.
Personally I dont come across many 10 year old boilers that need replacing but sometimes it happens, my way of looking at it is if you have had 10 years trouble free heating and hotwater it owes you nothing so I would look at replacing instead and get 7-10 years warranty on a new boiler have it serviced every year and start the cycle again.
The main thing that makes boilers beyond repair is the cost of spares. Manufacturers are having to make money back to cover the long warranties so they put that on spares.
You could get a second opinion and if it is full of dirt then you could get it flushed and filter fitted which could get a few more years out of it.