The Honeywell T4M is a programmable, modulating thermostat. The thermostat is suitable for a modulating boiler with OpenTherm protocol and floor heating. Thanks to the simple settings and the modulating function, you'll be saving energy costs in no time. You can set up to 6 different temperatures per day. Besides that, the thermostat is self-learning, so it automatically adjusts the temperature in your house according to your use. The screen lights up when you touch it, which is useful for in the dark. Are you going on a vacation? Set it to vacation mode. Once you get back, the thermostat will automatically switch to the regular week program again.