wireing for traveling undergroud

[mrcabrach]

hi i am installing new boiler in out building just want to know what type of underground cable i need to ask for to go between heating control & circulation pump

 

[RF Lighting]

Is the boiler going outside and the controls inside?

Will the pipework between the house and the outhouse be metallic or plastic?

 

[mrcabrach]

yes control panel inside circulation pump outside in shed
will run cable along hot water pipe supply trench pipes are all plastic

 

[RF Lighting]

I'd go with a 12 core 1.5mm² SWA cable installed in a 50mm black PVC duct.