Greenbrook 24Hr Mechanical Economy 7 Timer with Boost Timer 16A – T109

The Greenbrook T109 Economy 7 Immersion Heater Timer is a mechanical hard-wired timer designed to provide convenient and economical control of immersion heaters, allowing users to take advantage of off-peak electricity tariffs for hot water heating.

Rated at 16A and suitable for immersion heaters up to 3.5kW, the T109 offers 96 ON/OFF settings per day, providing flexible control over heating periods. The shortest switching interval is 15 minutes, making it easy to tailor hot water operation to suit individual requirements.

For additional hot water outside the programmed periods, the timer incorporates an adjustable 15–120 minute boost facility with an ON indicator. A manual override and ON/Timed/OFF switch selector provide additional control when required.

The unit features a durable polycarbonate enclosure, mechanical display and a tamper-proof timer cover. Designed for surface mounting, its compact white enclosure makes it suitable for domestic hot water installations.

Key Features

• Designed for Economy 7 / off-peak electricity use
• Suitable for controlling immersion heaters
• 16A maximum load
• Suitable for immersion heaters up to 3.5kW
• 96 ON/OFF settings per day
• 15-minute minimum switching interval
• Adjustable 15–120 minute boost facility
• Boost ON indicator
• Manual override facility
• ON / Timed / OFF switch selector
• Mechanical timer operation
• 2-pole manual switch
• Tamper-proof timer cover
• Hard-wired connection
• Surface-mounted installation
• IP20 rated
• 1-year Greenbrook guarantee

Technical Specification