If your heating system is pressurized, you will have to open the filling loop slightly to top up the system pressure while the radiator is re-filled.
Check the boiler’s water pressure gauge and follow the user instructions for your specific model to top up the pressure. For open-vented systems, water will be automatically replaced into the radiator as the valves are re-opened.
And there you go! You now have everything you need to be able to remove a convector radiator for decorating or to be replaced with a different model. Best of luck and don’t forget – if all else fails you can seek the help of professionals.
All the best for a safe radiator removal and enjoy your newly decorated space!