The Greenstar Comfort II combines a programmer that is typically plugged into the boiler and a room thermostat so you can access to all control functions at a single easily accessible location. The control allows you to set 6 adjustable heating temperatures per day and can be accessed through a simple menu structure with a minimal amount of steps. The control also includes a number of functions that are for exclusive use by the installer/service engineer for use during installation commissioning annual servicing and to assist with fault-finding.