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Replacement for Kidde KF30 Mains Powered Heat Alarm
The Kidde KF30 is a mains-powered heat alarm with a 9V backup battery. The replacement Kidde alarm utilises the same baseplate and connector plug to provide an easy swap-out. Featuring a 6 year manufacturer's warranty, it can be interlinked with other Kidde Firex alarms through a hardwired connection, so can easily be added to an existing system.
A heat alarm uses a thermistor heat sensor rather than detecting smoke, so cooking fumes and steam won’t set it off. This makes it ideal for kitchens and garages, where a smoke alarm would be more likely to give false alarms.
- Power: 230V mains powered with battery backup
- Backup battery: 9V alkaline battery (replaceable)
- Warranty: 6-year warranty
- CE and UKCA marked, Kitemarked to BS 5446-2: 2003
- Suitable for installations complying with BS 5839-6: 2019 Grade D2
- Hardwire interlinks with up to 23 other compatible Kidde Firex alarms (24 in total)
- Combined test and hush button
- Alarm memory function
- Supplied with fixings and a coloured dust cover (ideal for use when decorating)
- This alarm is also suitable for the updated 2022 Welsh and Scottish legislation for fire alarms in homes
Customer Reviews
FAQs
Technical Data
Datasheets
Interlink
Customer Reviews (16)
Reviewer
C T
Published on
9th November 2026
Reviewer
E C
This was a like for like replacement for an out of date alarm. Easy to fit into existing frame
Published on
2nd November 2026
Reviewer
C L
Ditto above
Published on
18th October 2026
Technical Data
| Product Code | KEKF30 |
|---|---|
| Brand | Kidde |
| Manufacturer's Part Number | KF30 |
| Approvals & Markings | CE Marked |
| Back-Up Battery Type | Alkaline |
| British Standard Grade | Grade D2: Mains Powered (replaceable backup) |
| Colour | White |
| Compliance | BS 5446-2: 2003 |
| BS 5839-6 | |
| Connection | Wired |
| Display | LED Indicators |
| Fixing Options | Screws (included) |
| Installation Position | Ceiling |
| Local Legislation | Northern Ireland Legislation (2024) |
| Scottish Legislation (2022) | |
| Welsh Legislation (2022) | |
| 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 |
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 |
| KF21 | Optical Smoke Alarm | Hardwire interlink |
| KF21R | Optical Smoke Alarm with Rechargeable Lithium Cell | Hardwire interlink |
| KF31 | Heat Alarm | Hardwire interlink |
| KF31R | 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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I purchased this item to replace the same item. Replacing the item is straightforward as the base plate is the same so it is simply a matter of sliding the old one off and sliding the new one on. Safelincs deliver the items promptly and I am happy to recommend them.