Yes. To enter radiator mode (called Heat Plus Mode):
Press (power) button to put the heater into standby mode, then hold down (+) for 10 seconds to enter the settings menu.
Press (checkmark) button twice to navigate to Heat Plus Mode (you will know you are in heat plus mode when a temperature between 65°C and 75°C displays).
Press the (+) or (-) buttons to set the internal temperature from 65°C to 75°C in steps of 5°C.
When the surface temperature hits the selected temperature, it will stop heating and will heat again once the surface temperature falls lower than the selected temperature.
https://www.electricradiatorsdirect.co.uk/manuals/reina/Reina-Nika-Manual.pdf