LavaPlumb 7 Day Central Heating Timer, Replaces Honeywell ST9100A | Single Channel, Also Fits ST9100C and ST6100 Backplates, 3 On/Off Periods a Day, Boost and Holiday Mode, Backlit Screen

Replaces Honeywell ST9100C: A straight swap for the ST9100C, ST9100A and ST6100. Unclip the old timer, clip this one onto the same 6 terminal wired backplate and the wiring stays as it is Also replaces the ST7100: Fits in place of a Honeywell ST7100 timer too, but that one needs a wiring change at the backplate, carried out by a competent person Made and supported by Resideo: The company behind Honeywell Home, and Honeywell's home heating business until 2018. Installer-trusted and backed by a 3-year warranty. Reliable, affordable, UK-compatible Check your system first: A wired 230V mains single channel timer for combi boilers and heating only systems. Not wireless or Wi-Fi. For heating plus a hot water cylinder, choose a 2 channel model Up to 3 heating periods a day: Set each day on its own with up to 3 on and off periods, or use 5/2 day or 1 day programming. Copy Day repeats a day across the week in one press One touch overrides: Extra Hour adds 1 to 3 hours, Override switches the heating on or off until the next period, and Holiday mode turns it off for up to 99 days, then resumes Ready to run, easy to read: Energy saving schedule set from the box, automatic summer and winter clock change, settings kept in a power cut with no batteries, and a backlit text screen