Mains Powered 3 Smoke Alarms and 1 Heat Alarm Kit with Alkaline Back-up Battery - Kidde Firex KF Series
This kit is supplied with three smoke alarms and one heat alarm from the Kidde Firex KF range. The alarms in this bundle are mains powered with an alkaline back-up battery to ensure that the alarms continue to work during a mains power outage. One system can consist of up to 24 compatible Kidde KF devices to provide maximum protection for your home. These alarms can be hardwire interlinked to ensure that if one alarm is activated, the other alarms in the system also activate and alert all occupants to the danger. All alarms feature a 6 year warranty.
- Ideal for installation throughout your home
- Smoke Alarms: Hallways, landings, bedrooms, living areas
- Heat Alarm: Kitchen, garages, unoccupied loft spaces
- Power: 230V mains powered with alkaline back-up battery
- Back-up Battery: 9V alkaline battery (included)
- Warranty: 6 year manufacturer's warranty
- CE marked and Kitemarked
- Smoke Alarm:
- Heat Alarm:
- Suitable for installations complying to
- Can be hardwire interlinked with up to 24 compatible devices
- Neat slimline design with a combined test/hush button
- LED display and supplied with a dust cover (to protect the unit temporarily during dusty work)
- Low battery warning chirp - can be silenced up to 8 hours
- This alarm is also suitable for both the Welsh and Scottish updated 2022 legislation
Customer Reviews (15)
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.
Reviewed by
T T
Published on
27th November 2025
Reviewed by
P R
Published on
23rd May 2025
Good products with good advice
Reviewed by
H B
Published on
11th August 2024
Good service and good product.
Reviewed by
T G
Published on
26th January 2024
Good quality fittings
Clearer instructions on how to fit in a plasterboard ceiling would help
Reviewed by
C C
Published on
18th December 2023
Great products, easy to fit - and really quick delivery too.
Technical Data
Kidde Firex KF20 Mains Powered Optical Alarm
| Product Code | KEKF20 |
|---|---|
| Brand | Kidde |
| Back-Up Battery Type | Alkaline |
| British Standard Grade | Grade D2: Mains Powered (replaceable backup) |
| Colour | White |
| Local Legislation | Scottish Legislation (2022) |
| Welsh Legislation (2022) | |
| Approvals & Markings | CE Marked |
| Compliance | BS 5839-6 |
| BS EN 14604: 2005 | |
| 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 | Bedrooms |
| Hallways | |
| Living Rooms | |
| 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 | Optical |
| Sound Level | 85dB |
| Suitability | Home |
| Warning Type | Audible - Alarm Sounder |
| Warranty | 6 Years |
| Dimensions (Unit) |
|
| Weight | 280g |
| Datasheets |
Kidde Firex KF30 Mains Powered Heat Alarm
| 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) |
|
| Weight | 400g |
| Datasheets |
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 |
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Neat clean change for old alarms
Nice to have white alarms again rather than the old yellowed ones. Should have changed them much sooner.
Husband found the heat detector a bit of a pain to fit for our setup as the ceiling space was tight. We had to use the old stand-off collar from before which required me to paint it white to match but looks ok once finished