Honeywell T4M Wired Opentherm Thermostat

The Honeywell T4M is a 7 Day programmable modulating OpenTherm thermostat. The T4M is a wired thermostat and features Load Compensation & Optimisation as standard. The Honeywell T4M can be used as a weather compensation thermostat when the boiler is fitted with an external sensor.

Features & Benefits

• Specifically designed to work with Open-Therm boilers
• Simplified display for programming and operation for all users
• Energy saving OpenTherm modulation control
• Optimum stop, start & delayed start features that learn how the room is heated
• Two wire, OpenTherm connections are ideal for use with combination boilers
• New improved wall plate with extra wiring space
• Clip on cover to the fixed wall plate
• On screen heat demand icon makes start up testing easy
• Simple push button access to configuration menus
• Adjustable Frost protection
• Away mode with specific temperature set (number of days changeable)
• Temporary schedule override until next set point or for 1 or 2 hours
• Schedule can be turned off ? will operate as a variable setting thermostat only
• Continuous time, displayed in extra-large LCD
• Automatic Summer-Winter time change
• 7-day programming with 7 day; 5-2 or single day schedules
• Four or six independent time & temperature settings
• Pre-configured 5-2 heating schedule
• Optional backlight with extended light on time period
• Burner 'ON' symbol