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Mains Powered Optical Smoke Alarm with Back-Up Battery - Kidde Firex KF20

From: £19.99 ex VAT
£23.99 inc VAT
Product Overview

The updated Kidde Firex KF20 and KF20R alarms are mains powered, interconnectable optical smoke alarms that use up to 70% less energy than previous Firex models. The KF20 has an alkaline battery back-up and the KF20R, a rechargeable lithium battery back-up. The units are hard wired and can be interconnected with other units from the series to create all round fire protection within the home.

  • 230V mains powered optical smoke alarm
  • Optional alkaline or rechargeable lithium back-up battery versions
  • Up to 70% less energy consumption compared to previous Firex models
  • 6 year warranty
  • A maximum of 24 units can be interconnected via signal cable
  • Kitemarked to BS EN 14604:2005 - view the certificate
  • Suitable for installations complying to BS 5839-6: 2013 Grade D, E and F
  • CE marked
  • LED indicator
  • Test / Hush button
  • Low battery warning chirp - can be silenced for 8 hours
  • Supplied with dust cover (to protect unit temporarily if you carry out dusty work)

Please Note: The Kidde Firex KF20 (previously Kidde 4973 / KF2) and KF20R (previously Kidde 4985 / KF2R) are replacements for the Kidde 2239HI and 2239HILLs and can still be interconnected, however the new models cannot be used on the same base plates and use different connector blocks.
Interconnection

The table below shows all the units that can interconnect with the KF20 and KF20R.

Alarms from the same series
Model Number
Type of unit
Type of interconnection
Optical Alarm
Hard wire interconnection
Optical Alarm with Rechargeable Lithium Cell
Hard wire interconnection
Heat Alarm
Hard wire interconnection
Heat Alarm with Rechargeable Lithium Cell
Hard wire interconnection
Ionisation Alarm
Hard wire interconnection
Ionisation Alarm with Rechargeable Lithium Cell
Hard wire interconnection
KEKF2
Optical Alarm
Hard wire interconnection
KEKF2R
Optical Alarm with Rechargeable Lithium Cell
Hard wire interconnection
KEKF3
Heat Alarm
Hard wire interconnection
KEKF3R
Heat Alarm with Rechargeable Lithium Cell
Hard wire interconnection
KEKF1
Ionisation Alarm
Hard wire interconnection
KEKF1R
Ionisation Alarm with Rechargeable Lithium Cell
Hard wire interconnection
Carbon Monoxide Alarms
Model Number
Type of unit
Type of interconnection
CO Detector with Rechargeable Lithium Cell
Hard wire interconnection
Compatible Alarms
Model Number
Type of unit
Type of interconnection
KE1239HI
Ionisation Alarm with Alkaline Battery
Hard wire interconnection
KE1239HILL
Ionisation Alarm with Lithium Battery
Hard wire interconnection
KE2239HI
Optical Alarm with Alkaline Battery
Hard wire interconnection
KE2239HILL
Optical Alarm with Lithium Battery
Hard wire interconnection
KE3239HI
Heat Alarm with Alkaline Battery
Hard wire interconnection
KE3239HILL
Heat Alarm with Lithium Battery
Hard wire interconnection
I240C
Ionisation Alarm with Alkaline Battery
Hard wire interconnection
PADC240
Optical Alarm with Alkaline Battery
Hard wire interconnection
KE4973
Optical Alarm with Alkaline Battery
Hard wire interconnection
KE4985
Optical Alarm with Lithium Battery
Hard wire interconnection
KE4899
Heat Alarm with Alkaline Battery
Hard wire interconnection
KE4892
Heat Alarm with Lithium Battery
Hard wire interconnection
KE4870
Ionisation Alarm with Alkaline Battery
Hard wire interconnection
KE4881
Ionisation Alarm with Lithium Battery
Hard wire interconnection
Technical Data

This is the technical data for the Mains Powered Optical Smoke Alarm with Back-Up Battery - Kidde Firex KF20.

Dimensions (HxDia) 39x133mm
Sound Output 85dB (minimum) at 3m
Temperature Range 0° to +40°C
Back-Up Battery KF20: 9V Alkaline
KF20R: Longlife Lithium

Technical Data Sheets

The following technical data sheets are available for this product:

Pricing & Availability

Model Stock Levels Price Weight
Kidde KF20 - Alkaline Battery Backup
Product Code: KEKF20
In Stock

£19.99 ex VAT

£23.99 inc VAT

0.28kg
Kidde KF20R - Rechargeable Lithium Battery Backup
Product Code: KEKF20R
In Stock

£32.99 ex VAT

£39.59 inc VAT

0.28kg

Customer Reviews

5 customers have rated this product and it has an overall rating of 4.2 out of 5

All our reviews are written by real customers that have purchased this product from us and are publsihed without modification.

5 / 5 Stars

Reviewed by: TK

Easy replacement of older model and excellent service from Safelincs

Published on: 22nd May 2016

4 / 5 Stars

Reviewed by: MN

Good product. No issues. Great service from Safelincs. Needed a mount which was not clear.

Published on: 8th April 2016

4 / 5 Stars

Reviewed by: SE

Good replacement for faulty alarm Good guide on website to know what the correct replacement is as mine was out of date.

Published on: 4th April 2016

4 / 5 Stars

Reviewed by: JM

Good product.

Published on: 3rd April 2016

4 / 5 Stars

Reviewed by: JJ

Appears to do the job required

Published on: 15th February 2016

Looking for more information?

If you have any questions or would like more information about this product you can ask one of our specialists.

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