The Drayton LP711 Timeswitch MK4 (25478) is a mechanical heating programmer used to control the on/off timing of a central heating system. It allows you to set periods during the day when your heating (and, where connected, hot water) will be switched on or off according to your schedule.

Function & Purpose

This timeswitch uses a 24-hour dial with adjustable pins or segments to define when the heating should be active. As the dial rotates through the day, the pins engage the internal switch to turn the heating circuit on or off at the selected times. It provides a simple, reliable way to automate heating periods without digital programming or smart features—ideal for traditional heating systems and straightforward daily control.

Compatibility

The LP711 Timeswitch MK4 is designed to work with central heating boilers and systems that accept an external timer or programmer input. It interfaces with boiler control circuits or room thermostat wiring to provide the on/off demand signal for heating. The mechanical nature of the unit makes it compatible with a wide range of conventional boilers, including combi, system, and regular models that use a timed demand for heating.

Ideal Applications

This mechanical timeswitch is ideal for:

Homes where straightforward heating schedules are needed without digital complexity
Older or traditional boiler installations that do not use smart or programmable thermostats
Users who prefer a physical dial and simple weekly routine control
Systems where only basic timing (e.g., morning and evening heating periods) is required

The Drayton LP711 is appreciated for its simplicity, ease of use, and reliability, making it a practical choice for basic heating schedule control in domestic environments.