In full working order 2 years old removed by Octopus Energy engineers from existing system when a heat pump has been installed. The Honeywell ST9100C 1006 Timer Programmer is a programmable thermostat designed for controlling boiler heating systems. With a 7-day programming capability, this digital control features a rectangular shape and can be wall-mounted or surface-mounted. Made of plastic, it includes features like a timer and is ready for daylight savings time adjustments. Ideal for efficiently managing heating schedules in a programmable manner, this thermostat by Honeywell offers convenience and energy savings for home heating systems.