Hi, I bought a 2 bedroom house and I found a brand new Viessmann Vitodens 050-w installed but it doesn't have a thermostat. All the radiators have TRV's but in order to heat up the property I need to leave the boiler on all night and I have to set the desired temperature of the water in the radiators (70 degrees for example) and then let the boiler circulate and heat the water all night long. A friend of mine has a brand new Vaillant and he bought from screwfix a wireless Flomasta thermostat and after watching some YouTube videos he was able to install it on his boiler (he is a handyman) So I bought the same wireless Flomasta thermostat from screwfix but I don't know exactly how to install it. I read the instructions and there was something about volt free connections and I have a 4 pin connector on my vitodens 050-w but in the manual it said that those connectors have 230 volt in them. And now I am a bit puzzled. I have a connector on the boiler with 4 wires. 1 - white 2 - brown 3 - black 4 - blue And at the moment there is a small bridge cable between 1 and 2 (white and brown cables) On the other site there is the thermostat with 2 pieces, one wired and one without wires. The wired one has exactly 4 coloured cables coming out at the end of the main cable and the colours are similar to those on the boiler. Does anyone know where exactly do I need to connect those 4 wires from the thermostat to the boiler? I will upload a picture of the connector on the boiler.