Horstmann Digital Timer Controller SIR021

Horstmann SIR021 — 30/60/120-Minute Digital Timer Control for Energy-Saving Appliance Switching

The Horstmann SIR021 is a simple push-button digital timer designed to reduce wasted energy by automatically switching appliances off after a preset time. Ideal for boiler overrides, immersion heaters and electric heaters, it provides straightforward timed control up to 3kW (resistive), helping users avoid leaving appliances running longer than necessary.

Simple Push-Button Operation

Each press of the front button cycles through 30, 60 and 120-minute settings, clearly shown by the countdown LED indicators. Once selected, the connected load switches off automatically at the end of the period, or can be turned off manually at any time using the same button.

Energy-Saving Control for Multiple Applications

Part of the Horstmann SIR range, the SIR021 is suitable for a wide variety of electrical loads including immersion heaters, panel heaters, heated towel rails, oil-filled radiators and forced ventilation systems. By limiting run time, it delivers meaningful energy savings with minimal user interaction.

Installer-Friendly Design

The unit supports both flush and surface mounting and features easy-access terminals for quick wiring. With a compact profile and single-gang mounting, it is well suited to retrofit projects as well as new installations in domestic and light commercial environments.

Key Features of the Horstmann SIR021 Digital Timer Control Include:

• Simple Push-Button Digital Timer For Easy Timed Control
• Selectable 30, 60 And 120 Minute Countdown Periods
• Automatic Switch-Off Helps Reduce Energy Waste
• Manual Off Function Available At Any Time
• Suitable For Loads Up To 3kW (Resistive)
• Clear Countdown LED Indicator Shows Remaining Time
• Ideal For Boiler Override And Extension Timing
• Compatible With Immersion Heaters And Electric Heaters
• Flush Or Surface Mounting For Installation Flexibility
• 7 Year Manufacturer Warranty

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