Replacing the central heating system or not?

[teaboyjim]

What's the best way to find out if I need to replace central heating system. Pay a plumber to come and test?

 

[Gasguru]

Better off posting pics on here...
Look at the fittings/pipework carefully to get an idea whether it's old and imperial or metric.
Try a magnet for fake copper pipe from the 60s and 70s.

 

[Madrab]

If it's just the wet (water side) central heating sections then any plumber that has good pipe skills can do the work. Advisable to pressure test the system once complete.

 

[oldbuffer]

Why not pressure test the system as it is? If it passes, you don't need to change, if it doesn't, then you have your answer. If it hold pressure at 4 bar, then it is fine for a sealed or open vent system.