To set temperature, press (power) button to enter the comfort mode from Standby mode. The default set temperature is 19°C.
Increase or decrease the temperature to the desired temperature in steps of 0.5°C by pressing the (+) and (-) buttons. The available range is from 7°C to 30°C.
https://www.electricradiatorsdirect.co.uk/manuals/reina/Reina-Nika-Manual.pdf