The SECURE H3747 Smart 4 Channel Receiver with Programmable Room Thermostat in white features a sleek digital control style and a 7-day programmable thermostat for efficient heating control. Designed for wall mounting, this unit is compatible with Horstmann brand systems and has a smart home compatibility for seamless integration into your home automation setup. With a 240V voltage and a 3V button cell battery size, this programmable thermostat offers convenience and energy savings. The digital display and temperature sensor technology make it easy to use and provide accurate readings, making it a reliable choice for maintaining the ideal indoor temperature.
3 Channel Time switch. Have used them in the past when they were made by Horstman. I know of no other that has 3 channels which are needed for a boiler which has central heating, hot water and a cooker