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Mains Powered Smoke Alarms & Heat Alarms with Alkaline Back-up Battery - Kidde Firex KF Series

4.8 out of 5 stars
Choose a product To see stock availability
From: £21.00 inc VAT
£17.50 ex VAT
Product Overview

The updated Kidde Firex range of smoke and heat alarms are mains powered, interlinking units that now use up to 70% less energy than previous Firex models. Hard-wired with alkaline back-up batteries, these alarms can be interlinked with other units from the series to create all round fire protection within the home; when one alarm detects smoke/heat and sounds, all units will sound. Installing the right sensor types in your property gives you the fastest possible response time with the minimum number of false alarms.

  • Mains powered with alkaline back-up battery
  • Suitable for installations complying to BS 5839-6: 2019 Grade D2
  • Kitemarked to BS EN 14604: 2005 and CE marked
  • 6 year warranty
  • Please see our replacement for the KF10 Ionisation model which has been discontinued
  • A maximum of 24 units can be interlinked via signal cable
  • Neat slimline design
  • 230V hard-wired smoke alarm
  • Up 70% less energy consumption compared to previous Firex models
  • LED display
  • 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)
  • Dimensions (HxDia.): 38 x 133mm
  • This alarm is also suitable for both the Welsh and Scottish updated 2022 legislation

Please Note: The Kidde KF Firex models are replacements for the older Firex 4000 series, Kidde 9HI and Kidde 9HILLs and can 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 Firex KF10, KF20 and KF30.

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
KEKF10R
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
Product Code

KF20 Optical Smoke Alarm:  KEKF20

KF30 Heat Alarm:  KEKF30

Brand Kidde
Back-Up Battery

9V Alkaline

Dimensions (HxDia)

39 x 133mm

Operating Temperature

0° to +40°C

Relative Humidity

Up to 93% Relative Humidity (RH)

Sound Output

85dB

Weight 0.40kg
Product Datasheets

Pricing & Availability

Model Stock Price
KF20 Optical Smoke Alarm
Product Code: KEKF20
Stock Level:
More than 20 in stock Expected dispatch: 28th May
Price:

£21.00 inc VAT

£17.50 ex VAT

KF30 Heat Alarm
Product Code: KEKF30
Stock Level:
More than 20 in stock Expected dispatch: 28th May
Price:

£30.60 inc VAT

£25.50 ex VAT

Delivery Options

The following delivery options are available on this product.

Standard Delivery

£3.19 inc VAT - Orders will be delivered in 2-3 working days with Evri

Next Working Day Delivery

£6.19 inc VAT - Orders will be delivered the next working day with Evri

For dispatch today order within

Customer Reviews

58 customers have given this product an overall rating of 4.8 out of 5

Reviews by real customers

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

Rating: 5 / 5 Stars

Reviewed by: S P

Good unit, fast delivery.

Published on: 11th April 2024

Rating: 5 / 5 Stars

Reviewed by: G M

Superb A service second to none

Published on: 14th January 2024

Rating: 5 / 5 Stars

Reviewed by: R C

does the job...hopefully! Delivered on time and straight forward to install

Published on: 6th January 2024

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