The Vaillant Timeswitch 150 is a simple and analogue heating control that works alongside the VRT 50 eBus room thermostat. It gives the user the ability to control the timing and length of boiler operation throughout the day, and the load compensation modulates the output of the boiler via eBus for increased energy efficiency, adding 3 percentage to the SAP efficiency rating. The timeSWITCH 150 is a simple and analogue heating control works alongside our VRT 50 eBus room thermostat. Allows for adjusting the heating.