Removed from job. Excellent condition Old style Honeywell ST 7100 missing grub screw, see photo The Honeywell ST7100 Central Heating Timer Programmer is a white rectangular thermostat designed for wall-mounting. It offers 7-day programmability with 7 periods per programmable day, making it convenient for controlling your central heating radiator system. This timer feature allows you to set specific times for your heating to come on and off, helping you save energy and stay comfortable. With its smart home compatibility and temperature sensor technology, this programmable thermostat from Honeywell is a reliable choice for efficient heating control in your home.