What to feed a radiator in?

[Bogart]

Yes I know is a bit basic the header but have been milling this over for ages. Needs doing now as autumn approaching. I need to take a feed off a radiator in one room to feed another in an adjacent room. Problem is the doorway which I will have to cross. It is possible to cross under the threshold as there is space. My quandry is what to use 15mm copper or plastic or 10mm copper or plastic. I have all the pipes and fittings needed so just need to be told which to use. There will be some awkward bits going up and down the door frame slightly , right angles into and out of both rooms. I could run 15mm copper all around the door frame but not the best asthetically. I have a 10mm copper pipe bender which I have never used. Can 10mm copper be tugged around bends a bit like one can with plastic or will it kink easily. I am favouring 10mm plastic for the awkwards bits and 15mm copper for the mainly visible portions. Any suggestions? And finally can a plastic fitting with a spigot end be put straight into a radiator valve?

 

[ShaunCorbs]

What’s the drop to the existing rad ?

 

[Bogart]

What’s the drop to the existing rad ?

From floor above but existing pipework hidden in wall structure.

 

[Bogart]

Added a few of pics to hopefully explain it better. Pic one if feed from upstairs. I need to tap off both these pipes to feed the radiator shown in pic two. Is a vertical grey one hence not seen too well. Can see better in pic three.

 

[ShaunCorbs]

It’s in 15mm so I would use 15mm copper if if the route is a bit snakey 10mm copper

 

[Ben-gee]

If pipework comes from above, can you not pick it up up there and run it above that ceiling and drop down in corner once you’re past the door?

 

[Bogart]

It’s in 15mm so I would use 15mm copper if if the route is a bit snakey 10mm copper

I could do in 15mm to the door frame region then drop to 10mm for getting across the doorway and then once out the wall at the far side go back to 15mm, bit of a fuff but avoids 3/4m of 10mm pipe.

 

[Bogart]

If pipework comes from above, can you not pick it up up there and run it above that ceiling and drop down in corner once you’re past the door?

That would be ideal if it were not that it is a listed building and no idea where the pipework is above just where it appears at low level.

 

[ShaunCorbs]

It’s best to run in one size don’t flip flop so if you can only get in 10 mm use all 10mm

 

[Bogart]

It’s best to run in one size don’t flip flop so if you can only get in 10 mm use all 10mm

Oh was thinking total of 10mm pipe would be between flow and return around 8m. Will do in 10mm then. Thanks

 

[SimonG]

15mm copper for me and make it fit.

 

[Last Plumber]

What is the output from the rads?

 

[Bogart]

15mm copper for me and make it fit.

Easier said than done!

 

[Bogart]

Chickened out and moved the radiator, job done.