8mm pipe replacement

[apnet]

Hi,

I need to replace an 8mm heating pipe with 15mm.

The main 22mm pipe where the 8mm starts from is under some laminated flooring. I don’t want to lift up the floor.

My question is: Can I leave a 1 meter length of the 8mm pipe and attach the new 15mm pipe to the 8mm? Will I lose the better flow benefit of the 15mm pipe?

My heating is all 8mm, we have had an extension built and a new radiator installed. The plumber has taken a feed off one of the existing radiators for the new radiator. As a result both radiators do not heat up fully, I have tried to balance them but with little success.

Any help would be greatly appreciated.

Thanks

 

[seco services]

not going to gain much with 8mm still restricting it. the plumber should know this.

 

[kirkgas]

you should never tee into 8mm for another rad, always go back to the main circuit otherwise it won't work properly

 

[giblets]

Ahhh - laminate flooring - the indoor equivalent of block paving.

'Fraid you will either have to lift the flooring or find somewhere else to feed the new rad from.