Radiator pipes

[ambercelery]

Can someone please explain something to me?

As far as i know, radiators have water coming into them into a thermostat (usually on the top of the radiator) - the water then flows through the radiator, and out through the valve and out along the other pipe.

Why is it that the pipe leading out of my radiator (the one attached to the valve) feels a lot hotter, that the one leading into my radiator (the one attached to the thermostat).

I would have though the incoming pipe would be hotter than the pipe going out if anything?

 

[kevplumb]

stat is on the return

 

[Roddders]

On the new Thermostatic Radiator Valves they can be fitted on either side of the radiator and therefore if it is actually fitted on the return end of the pipe it will have this effect