Best way to connect 10mm plastic pipe to 8mm micro bore

[Craigy boy]

Hi all fitting new radiators and need to connect to 8mm micro bore copper pipe under floorboards, (full rework of pipes not an option) would 15mm plastic pipe be okay or just go up to 10mm plastic pipe ? Also best way to connect , compression or push fit ? Using inserts off course , additionally if I drained system down through current radiator valves would there still be a lot of residual water ,combi boiler system ? ( thinking in advance if compression fittings being used as I’m upstairs maisonette and don’t want water running to neighbour )thanks in advance

 

[gpbeck]

New radiators for cosmetic reasons or higher outputs?

 

[ShaunCorbs]

Repipe as you’ve already exposed it under the floor just find the manifold / spider and remove it

 

[Craigy boy]

New radiators for cosmetic reasons or higher outputs?

Cosmetic

 

[Craigy boy]

Repipe as you’ve already exposed it under the floor just find the manifold / spider and remove it

Manifold in other room and not possible , I didn’t mention I had 3 radiators total to do just want to splice into existing pipe work with minimum fuss

 

[ShaunCorbs]

Just use 3 part reducers eg 8-15mm in the new valves

 

[Craigy boy]

Just use 3 part reducers eg 8-15mm in the new valves

Doesn’t really answer any of my questions but thanks anyway