The Honeywell ST9100C is a reliable single-channel programmer designed to control a single heating zone or combi boiler in domestic central heating systems. It provides flexible scheduling and precise control of heating times, helping improve comfort while reducing energy consumption. The ST9100C supports mains, low voltage, or potential-free switching, making it suitable for a wide range of heating installations. Its 7-day programming capability allows users to set different schedules for each day, offering up to three on/off periods per day to suit varying heating requirements. Featuring Honeywell’s Line of Text (LoT™) display, the programmer provides clear, plain English prompts whenever a button or slider is used. This makes it simple for installers and homeowners to set up and operate without needing to refer to a manual. Designed for convenience, the ST9100C fits industry-standard back plates and can act as a direct replacement for ST6100 models, making upgrades quick and straightforward.

Key Features :

• 7-day single channel heating programmer

• Ideal for single heating zones or combi boiler systems

• 5/2-day or 1-day programming options

• Up to 3 on/off periods per day

• Large backlit display with clear Line of Text (LoT™) instructions

• Factory-set clock and date for quick installation

• Automatic Summer/Winter time change

• Temporary or permanent override functions

• Extra hour boost facility for up to 3 hours

• Holiday mode for energy savings while away

• Choice of 3 built-in programs

• Programme indicator lights

• Fits industry-standard back plate

• Direct replacement for Honeywell ST6100 models

• Suitable for mains, low voltage, or potential-free switching

• Non-volatile memory retains settings indefinitely

• Manufacturer warranty: 1 year