External Temp Control plate for use with a fixed temperature element (such as terma SIM) to give control of the temperature - perfect for retro fitting when you realise you need a little more control over the temperature and you don't wish to purchase a new element with that functionality. This device uses power to control the temperature so in essence pulses on and off to give the temprature in accordance with the chosen setting acorss 5 options. Fits over a standard flush mounted back box. This device is white but we alos offer a separate chrome fascia plate only, in case would prefer this have this fitted in chrome. Important: Max 1000w capacity - so please do not pair with this an element with a higher wattage than 1000w.