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Mains Powered Heat Alarm with Back-Up Battery - Kidde Firex KF30

Front view of Kidde Firex mains powered heat alarm with alkaline battery backup showing circular white casing and central button
4.8 out of 5 stars

20+ In Stock

Estimated dispatch: Tomorrow

£31.19 inc VAT

£25.99 ex VAT

Standard Delivery

Will usually be delivered in 2-3 working days

£4.20 inc VAT

Next Day Delivery

Will usually be delivered the next working day

£7.00 inc VAT

The updated Kidde Firex KF30 and KF30R alarms are mains powered interlinking heat alarms that are up to 70% more energy efficient than previous Firex models. These hard wired units have battery back-up cells and can be interlinked with other units from the series to create all round fire protection within the home. Heat alarms are the ideal detectors for kitchens and garages and are perfect for reducing nuisance alarms caused by cooking fumes and dust.

  • Power: 230V mains powered with battery backup
  • Backup: Optional alkaline or self-charging lithium backup battery versions
  • Warranty: 6 year warranty
  • Up to 70% more energy efficient than previous Firex models
  • A maximum of 24 units can be interlinked via signal cable
  • Suitable for installations complying to Grade D1 (KF30R) or Grade D2 (KF30)
  • Kitemarked to
  • CE marked
  • LED display
  • Test/Hush button
  • Low battery warning chirp – can be silenced for 8 hours
  • Heat alarms reduce the number of false alarms from cooking fumes and dust
  • The units are designed for installation in kitchens and garages
  • Supplied with free dust cover (to protect unit temporarily if you carry out dusty work)
  • Supplied with fixings; 2 x screws and 2 x rawl plugs
  • This alarm is also suitable for both the Welsh and Scottish updated 2022 legislation

Please note: The Kidde Firex KF30 (previously KF3 / 4899 / H230CT) and KF30R (previously KF3R / 4892 / HR230CT) are replacements for the Kidde 323/9HI and 323/9HILL series and can be electrically interlinked. However, the new models cannot be used on the old base plates for the 323/9HI and 323/9HILL series as they use different style connector blocks. This means that base plates must be swapped over on those stated models and connectors need to be replaced.

Customer Reviews

Customer Reviews (21)

4.8 out of 5 stars

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

Reviewed by

M M

Published on

23rd March 2025

Good product and quick delivery

Applies to option(s): Kidde KF30 - Alkaline Battery Backup

Rating: 5 / 5

Reviewed by

T S

Published on

23rd August 2024

Easy to install, works incredibly well!

Applies to option(s): Kidde KF30 - Alkaline Battery Backup

Rating: 5 / 5

Reviewed by

S H

Published on

29th May 2024

Excellent quality

Applies to option(s): Kidde KF30 - Alkaline Battery Backup

Rating: 5 / 5

Reviewed by

N L

Published on

5th March 2024

Fast delivery

Happy with purchase price

Applies to option(s): Kidde KF30 - Alkaline Battery Backup

Rating: 5 / 5

Reviewed by

T G

Published on

26th January 2024

No issues

Applies to option(s): Kidde KF30 - Alkaline Battery Backup

FAQs

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Technical Data

Technical Data

Product Code KEKF30
Brand Kidde
Back-Up Battery Type Alkaline
British Standard Grade Grade D2: Mains Powered (replaceable backup)
Colour White
Local Legislation Northern Ireland Legislation (2024)
Scottish Legislation (2022)
Welsh Legislation (2022)
Approvals & Markings CE Marked
Compliance BS 5446-2: 2003
BS 5839-6
Connection Wired
Display LED Indicators
Fixing Options Screws (included)
Installation Position Ceiling
Material Plastic
Maximum Number of Linked Devices 24 Devices
Operating Temperature 0°C To +40°C
Positioning Garages
Kitchens
Unconverted Loft Spaces
Power Type Mains Powered (230V)
Product Range Kidde Firex
Recyclable Yes - Valpak's WEEE Distributor Take-back Scheme
Relative Humidity Up To 93%
Sensor Type Heat
Sound Level 85dB
Suitability Home
Warning Type Audible - Alarm Sounder
Warranty 6 Years
Dimensions (Unit)
  • Height: 39mm
  • Diameter: 133mm
Weight 400g
Datasheets
Interlink

Interlink

Alarms from the Same Series

The table below shows all the units that can interlink with the Firex KF Series.

Model Number Type of Unit Type of Interlink
KF10 Ionisation Smoke Alarm Hardwire interlink
KF10R Ionisation Smoke Alarm with Rechargeable Lithium Cell Hardwire interlink
KF20 Optical Smoke Alarm Hardwire interlink
KF20R Optical Smoke Alarm with Rechargeable Lithium Cell Hardwire interlink
KF30 Heat Alarm Hardwire interlink
KF30R Heat Alarm with Rechargeable Lithium Cell Hardwire interlink
KF1 Ionisation Smoke Alarm Hardwire interlink
KF1R Ionisation Smoke Alarm with Rechargeable Lithium Cell Hardwire interlink
KF2 Optical Smoke Alarm Hardwire interlink
KF2R Optical Smoke Alarm with Rechargeable Lithium Cell Hardwire interlink
KF3 Heat Alarm Hardwire interlink
KF3R Heat Alarm with Rechargeable Lithium Cell Hardwire interlink

Carbon Monoxide Alarms

Model Number Type of Unit Type of Interlink
4MCO CO Detector with Rechargeable Lithium Cell Hardwire interlink
K4MCO CO Detector with Rechargeable Lithium Cell Hardwire interlink

Compatible Alarms

Model Number Type of Unit Type of Interlink
1239HI Ionisation Smoke Alarm with Alkaline Battery Hardwire interlink
1239HILL Ionisation Smoke Alarm with Lithium Battery Hardwire interlink
2239HI Optical Smoke Alarm with Alkaline Battery Hardwire interlink
2239HILL Optical Smoke Alarm with Lithium Battery Hardwire interlink
3239HI Heat Alarm with Alkaline Battery Hardwire interlink
3239HILL Heat Alarm with Lithium Battery Hardwire interlink
4870 Ionisation Smoke Alarm with Alkaline Battery Hardwire interlink
4881 Ionisation Smoke Alarm with Lithium Battery Hardwire interlink
4973 Optical Smoke Alarm with Alkaline Battery Hardwire interlink
4985 Optical Smoke Alarm with Lithium Battery Hardwire interlink
4899 Heat Alarm with Alkaline Battery Hardwire interlink
4892 Heat Alarm with Lithium Battery Hardwire interlink
I240C Ionisation Smoke Alarm with Alkaline Battery Hardwire interlink
PADC240 Optical Smoke Alarm with Alkaline Battery Hardwire interlink