Confused!

[Mowgli82]

Just finishing up on my tech certificates and cant seem to find any clarification on a central heating query. I may be being a complete idiot, but bear with me!

Looking at flushing the rads in my own house, and the previous incumbant has installed rads with microbore and rads with 15mm pipe - with no apparent reason that i can see other than his own convenience. To me and my limited knowledge, this doesnt seem to be quite right - question is though - is this actually a problem that needs resolving or is it actually ok as is?

Cheers

 

[Puddle]

Well it is not good practice,maybe original system done in one size/method and perhaps the system was extended/altered at a later date using different method
Does it need changing or a problem,well if all working ok,would think not

However without seeing is hard to say if problems could arise

 

[Toddyplumb]

Are the big rads on 15mm ? May be needs this for the heat outputs ?