Is it best to rip out the whole heating system?

[Markbon]

Hello. I need a new boiler and for it to be moved. The radiators are decades old and some of them need moving. So Should I rip the pipes out as well? In my last house we ripped it all out as the Plumber thought it a good idea as it was all 15mm and he wanted 22mm to run the long distances. But this house already has 22mm reducing to 15 near the rads. But I am wondering if having new clean pipes with a new boiler is the way to go?
Cheers.

 

[ianmcd]

As long as it is flushed properly when changing the boiler and Rads the pipes should be fine if they are copper and not buried in concrete

 

[Markbon]

Thanks.
Am I right in thinking that flushing would require the boiler to be working?

 

[sxturbo]

Thanks.
Am I right in thinking that flushing would require the boiler to be working?

No, they use a machine, they can connect to the flow and return and flush it, it's probably easier without the boiler connected