Query with correct pipe size for c. heating to new extn

[carlsbergy]

Hi all,

I'm having a new kitchen extension built and (4.2m x 3.4m) and have worked out I need a 7000 btu rad.(1200mmx600mm).

Would I run 15mm pipe to the new rad from my house or 22mm pipe to the radiator and then 15mm to the radiator ends?

 

[carlsbergy]

Also forgot to add when the pipes go under the screed do they get wrapped in the hessian type material or foam lagging?

 

[LUNAT]

HI

you can run in 15mm .
any pipe has to be protected against damage and corrosion when burying
under concrete .so if you use 22mm pipe as a sleeve then you will protect the inner pipe

 

[wiggikins]

Much easier to use 15 mm Kuterlite dontcha think??

 

[carlsbergy]

Do you mean sleeve the copper 15mm pipe with 22mm copper pipe or use plastic?