£38.95

It has never been this cheap. We have no record of a lower price.

£39 today · cheaper than every other day in the last 3 months

Kidde Firex KF20 Twin Pack - Mains Optical Smoke Alarms

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Price History & Forecast

Grey patches = out of stock. Cheaper = lower on the chart. Hover for exact prices.

Last 77 days · 77 data points (no recent data)

Historical
Generating forecast…
£39.66 £38.88 £39.05 £39.22 £39.39 £39.56 £39.73 01 August 2026 20 August 2026 08 September 2026 27 September 2026 16 October 2026
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White, KF2 4973

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Price Distribution

Price distribution over 77 days • 2 price levels

Days at Price
Current Price
73 days · current 4 days 0 18 37 55 73 £39 £40 Days at Price

Price Analysis

Most common price: £39 (73 days, 94.8%)

Price range: £39 - £40

Price levels: 2 different prices over 77 days

Description
Protect your home with the Kidde Firex KF20 Twin Pack. These mains-powered optical smoke alarms provide reliable detection for slow, smouldering fires, making them ideal for use in escape routes, circulation routes, and areas where furniture or surroundings may ignite from cigarettes. This pack includes two units, ensuring essential coverage throughout your living spaces. Designed for seamless integration, these alarms can be interlinked with up to 23 other Kidde mains alarms, including ionisation, optical, or heat models. When interlinked, a single unit detecting danger will trigger all connected alarms to sound, providing early warning across the entire property. Each unit operates on mains power and includes a 9V alkaline back-up battery as standard to maintain protection during power outages. These alarms are engineered for efficiency, featuring reduced energy consumption for lower lifetime running costs compared to previous Firex models. For easy maintenance, the combined Test/Hush button allows you to perform regular function tests and manage the alarm easily. Please note that this unit should be installed by a qualified electrician and is not suitable for kitchen use; for kitchens, a Firex Heat Alarm is recommended.

Key Features

Interlink up to 23 Kidde mains alarms, including ionisation, optical, or heat models, so all alarms sound if danger is detected by one unit.

Mains-powered operation with a 9V alkaline back-up battery supplied as standard to ensure continued protection during power failures.

Optical technology is specifically designed to detect slow, smouldering fires in escape routes and circulation areas.

Reduced energy consumption helps provide lower lifetime running costs compared to previous Firex alarm models.

Includes a combined Test/Hush button for easy regular testing of the alarm function and convenient management.

Designed for home use throughout most areas, though a separate Firex Heat Alarm is recommended for kitchen installations.

Product Specifications
Brand
Kidde
Model
KF2 4973
Colour
White
ASIN
B00LGX1TSC
Category
DIY & Tools > Safety & Security > Fire Safety > Smoke Alarms
Domain
Amazon UK
Listed Since
02 July 2014

Barcode

No barcode data available

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