Each eTRV controls a radiator valve to regulate the heating in the room, based on timed programmes, set temperatures and how the room is used under control of the MiHome network. Using the eTRV improves your comfort and saves energy. Each eTRV controls a radiator valve to regulate the heating in the room, based on timed programmes, set temperatures. Using the eTRV improves your comfort and saves energy. The benefit of having eTRVs is that it enables you to control each radiator or room individually rather than heating your whole house from a single thermostat. Therefore you only heat the bedroom when it is in use which is likely to be at a different time to the lounge or sitting room. By only heating the rooms you are in you can make significant savings. The Radiator Valves can be used with our other features such as programmes. This means you are able to set the required radiator valve to a specific temperature and at specific time on your settings in the App. We have customers using them in all sorts of ways including for security, convenience and energy saving purposes. As well as timers the Radiator Valves can be controlled with IFTTT, this allows you to turn them on using the weather, ESPN, Facebook to name but a few. It also means they can be used in conjunction with the Phillips Hue and Nest. Improves your comfort and saves energy.