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

From: 23.99 inc VAT
19.99 ex VAT
Product Overview

The updated Kidde Firex KF20 and KF20R alarms are mains powered, interlinking 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 interlinked 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 interlinked 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)
  • Supplied with fixings; 2 x screws and 2 x rawl plugs

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 interlinked, however the new models cannot be used on the same base plates and use different connector blocks.
Interlink

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

Alarms from the same series
Model Number
Type of unit
Type of interlink
Optical Alarm
Hard wire interlink
Optical Alarm with Rechargeable Lithium Cell
Hard wire interlink
Heat Alarm
Hard wire interlink
Heat Alarm with Rechargeable Lithium Cell
Hard wire interlink
Ionisation Alarm
Hard wire interlink
Ionisation Alarm with Rechargeable Lithium Cell
Hard wire interlink
KEKF2
Optical Alarm
Hard wire interlink
KEKF2R
Optical Alarm with Rechargeable Lithium Cell
Hard wire interlink
KEKF3
Heat Alarm
Hard wire interlink
KEKF3R
Heat Alarm with Rechargeable Lithium Cell
Hard wire interlink
KEKF1
Ionisation Alarm
Hard wire interlink
KEKF1R
Ionisation Alarm with Rechargeable Lithium Cell
Hard wire interlink
Carbon Monoxide Alarms
Model Number
Type of unit
Type of interlink
CO Detector with Rechargeable Lithium Cell
Hard wire interlink
Compatible Alarms
Model Number
Type of unit
Type of interlink
KE1239HI
Ionisation Alarm with Alkaline Battery
Hard wire interlink
KE1239HILL
Ionisation Alarm with Lithium Battery
Hard wire interlink
KE2239HI
Optical Alarm with Alkaline Battery
Hard wire interlink
KE2239HILL
Optical Alarm with Lithium Battery
Hard wire interlink
KE3239HI
Heat Alarm with Alkaline Battery
Hard wire interlink
KE3239HILL
Heat Alarm with Lithium Battery
Hard wire interlink
I240C
Ionisation Alarm with Alkaline Battery
Hard wire interlink
PADC240
Optical Alarm with Alkaline Battery
Hard wire interlink
KE4973
Optical Alarm with Alkaline Battery
Hard wire interlink
KE4985
Optical Alarm with Lithium Battery
Hard wire interlink
KE4899
Heat Alarm with Alkaline Battery
Hard wire interlink
KE4892
Heat Alarm with Lithium Battery
Hard wire interlink
KE4870
Ionisation Alarm with Alkaline Battery
Hard wire interlink
KE4881
Ionisation Alarm with Lithium Battery
Hard wire interlink
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 +40C
Back-Up Battery KF20: 9V Alkaline
KF20R: Longlife Lithium

Data Sheets

Pricing & Availability

Model Stock Levels Price Weight
Kidde KF20 - Alkaline Battery Backup
Product Code: KEKF20
Stock Level:
More than 20 in stock
Price:

23.99 inc VAT

19.99 ex VAT

Weight:
0.28kg
Kidde KF20R - Rechargeable Lithium Battery Backup
Product Code: KEKF20R
Stock Level:
More than 20 in stock
Price:

39.59 inc VAT

32.99 ex VAT

Weight:
0.28kg

Customer Reviews

12 customers have rated this product and it has an overall rating of 4.6 out of 5

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

4 / 5 Stars

Reviewed by: BS

Easy to fit, looks good Plug connector makes installation a little bit fiddly

Published on: 21st May 2017

5 / 5 Stars

Reviewed by: KD

Good service, as always

Published on: 7th February 2017

5 / 5 Stars

Reviewed by: GF

Easy to install, works perfectly.

Published on: 28th December 2016

5 / 5 Stars

Reviewed by: JG

excellent

Published on: 27th December 2016

5 / 5 Stars

Reviewed by: RM

Replaced old model 4985 with this, no problem

Published on: 11th November 2016

5 / 5 Stars

Reviewed by: SS

Easy to fit.

Published on: 30th October 2016

5 / 5 Stars

Reviewed by: DH

Easy to install, looks good.

Published on: 11th October 2016

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

Show All Reviews

Delivery Options

The following delivery options are available on this product.

Economy Delivery

Delivered in 3-7 working days by Royal Mail 4.68 inc VAT - More info

Next Day Delivery

Delivered the next working day by UK Mail from 7.80 inc VAT - More info

For delivery on order within

Delivery Options

The following delivery options are available on this product.

Economy Delivery

Delivered in 3-7 working days by Royal Mail 4.68 inc VAT - More info

Next Day Delivery

Delivered the next working day by UK Mail from 7.80 inc VAT - More info

For delivery on order within

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