How do you find out what side is the inlet and outlet on a radiator?

[AllThegearnoidea]

Hi, I have a radiator with two lockshield valves how do I tell what side is the inlet and what one is the outlet ?

 

[WC1]

Switch off heating.
Wait for it to cool down a bit
Switch on heating and see which side heats up as the hot water flows.
One rad with 2 lock is often deliberate.

 

[AllThegearnoidea]

Switch off heating.
Wait for it to cool down a bit
Switch on heating and see which side heats up as the hot water flows.
One rad with 2 lock is often deliberate.

So basically what side heats up first? Thanks for your reply

 

[WC1]

Yes, hot flows from the boiler then returns cooler.
Like I say its often deliberate, think carefully if you are wanting to put a trv on one side

 

[AllThegearnoidea]

Yes, hot flows from the boiler then returns cooler.
Like I say its often deliberate, think carefully if you are wanting to put a trv on one side

Thank you followed, your steps was evident what side was a lot hotter than the other side