Plumbing a Radiator and Identifying Feed and Return Pipes All aspects of plumbing questions and answers, help, tips and information

[Deebee1]

I have recently drained the system to replace all radiators, how can. I tell which is going to be the feed and return pipes now I can turn the combi boiler on

[thekeymurphy]

Does the pump have an arrow on it showing directional flow? If not, a bi-directional valve should do the trick. Alternatively, whichever one heats up first is the feed!

[Deebee1]

Hi

Original post should have said the boiler cannot be turned on as the is no pipes attached etc so cannot feel which pipe gets hot first.
I believe the valves are multi directional these days so hopefully it won't matter when I re attach pies etc

[Tall bloke]

It doesn’t matter which is the Heating Flow and Heating return at a radiator as the water will flow through the radiator anyway it can.