change radiator pipes from 10mm to 15mm

[gb17342]

Hello, I need to replace a radiator and want to change the current 10mm pipe in to the radiator with 15mm pipe. I have access under the floor so no problem to change the 10mm that comes off the 15mm hot water feed. If I change just one radiator to 15mm and leave the rest of the radiators as they are with 10mm pipes is that going to affect the system at all / is that bad practice?

 

[Jonathanjc]

You'll need to balance the system and really throttle down every other rad. You'll want an incredibly clean system any restriction might stop a rad working. Also, check how many rads are coming of that 15 you're connecting too. And when you say hot water feed do you mean flow and return for rads?

 

[king of pipes]

Do you mean adapting from 10mm to 15mm under the floor I did this one recently can't see a issue if done correctly. Kop

 

[gb17342]

thanks for the replies, I was only planning to use 15mm chrome for aesthetic purposes to match the new radiator valves and thought it would be fine to reduce 15mm pipes from the radiator to the 10mm pipes under the floor. Thinking about it though I'm just going to keep the pipes and use chrome covers, thanks for the advice.

 

[Ric2013]

Use chrome covers if you like, but changing a short section of pipe is unlikely to affect the balancing in any meaningful way. I'm not sure what the problem is. If you were substituting 10mm for existing 15mm, I'd be concerned, but enlarging the pipe diameter is neither here nor there.