10mm pipe or 15mm?

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Hello, I plan to run JG plastic pipe to my rads (all new system to existing combi). I assumed I would run 15mm up the walls and T on to the 22mm feeds but yesterday I had 2 people suggest different pipes to use, one said 10mm, another 15mm. Its a bungalow with 8 radiators. Any suggestions/advice appreciated.
Many thanks
 
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If using plastic I’d be tempted to use 15mm, because the bore will reduce slightly with the inserts. That said if it’s all new 10mm probably won’t be an issue - I have it in my new build property.
 
Hello, I plan to run JG plastic pipe to my rads (all new system to existing combi). I assumed I would run 15mm up the walls and T on to the 22mm feeds but yesterday I had 2 people suggest different pipes to use, one said 10mm, another 15mm. Its a bungalow with 8 radiators. Any suggestions/advice appreciated.
Many thanks
I always found Hep pipe much more flexible and the fittings more compact and easier to work with.
 

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