i have central heating but no radoator in one room the 2 pipes a under the floor how do i tell wots the feed from both

The flow will get hot first so wack on the heating and hold the pipes

You will have to lift the floor boards up to fit your radiator anyway! 'Kill two birds with one stone'............ as they say :/

Firstly it doesn't really matter which way round you connect to your new radiator. Almost all new radiator valves work both ways. If you still wanted to know turn on your central heating feel the pipes which ever gets hot first is the flow. Terry

If these are definately flow and return pipe work on the Central Heating System, it will make no difference what they are if capped they are just redundant legs. If you want to join on to these pipes to fit another radiator, you just need to fitt two way valves to radiator and will not matter how you attach them as flows can go either way through radiator. Regards, Bill Pipe Dreams Plumbing Services