The c/h boiler in our house is at least35 yrs old, the pipes and radiators must be a similar age. The boiler is serviced each year, it works fine. Basic , simple controls, just water temp and timer for ch and hw. I am a great believer in 'if it aint broke then don't fix it !' I know that it is not efficient but it keeps us warm and causes no problems. I asked the service engineer about replacing and he told me that a new boiler would have problens with the mucky water in our old but sound pipes and lots of double panel rads. Big water flow through lots of big pipes then going into a new boiler that would not like any contaminated water at all. New boiler I can cope with but not a complete c/h system in an old property that is our home ! His opinion of modern boilers was not high , he is ex British Gas. Poor quality metals used, regular parts failure after only 3/4 yrs etc.
Any opinions on this would be helpful.
Thanks
Brian