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Mains Ionisation Smoke Alarm - Kidde Firex KF1

From: £14.79 ex VAT
(£17.75 inc VAT)
Show prices and availability
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Kidde Firex KF1 and KF1R's are mains powered, interconnectable ionisation smoke alarms. The KF1 has an alkaline battery back-up and the KF1R, a rechargeable lithium battery back-up. The units are hard wired and can be interconnected with other units from the series to create all round fire protection within the home.

  • 230V Hard-wired smoke alarm
  • Optional alkaline or rechargeable lithium back-up battery versions
  • 6 year warranty 
  • A maximum of 24 units can be interconnected via signal cable
  • Certified to BS EN 14604:2005 - view the certificate
  • Suitable for installations complying to BS 5839-6: 2013 Grade D, E and F
  • CE marked
  • Neat Slimline Design
  • LED display
  • Test / Hush button
  • Low battery warning chirp
  • Supplied with dust cover (to protect unit temporarily if you carry out dusty work)

Please Note: The Kidde Firex KF1 (previously 4870) and KF1R (previously 4881) are replacements for the Kidde 1239HI, Kidde i240C / 1240C and 1239HILLs and can be interconnected however the new models cannot be used on the same base plates and use different connector blocks.


The table below shows all the units that can interconnect with the KEKF1 and KEKF1R.

Alarms from the same series
Model Number
Type of unit
Type of interconnection
Optical Alarm
Hard wire interconnection
Optical Alarm with Rechargeable Lithium Cell
Hard wire interconnection
Heat Alarm
Hard wire interconnection
Heat Alarm with Rechargeable Lithium Cell
Hard wire interconnection
Ionisation Alarm
Hard wire interconnection
Ionisation Alarm with Rechargeable Lithium Cell
Hard wire interconnection
Carbon Monoxide Alarms
Model Number
Type of unit
Type of interconnection
CO Detector with Rechargeable Lithium Cell
Hard wire interconnection
Compatible Alarms
Model Number
Type of unit
Type of interconnection
KE1239HI
Ionisation Alarm with Alkaline Battery
Hard wire interconnection
KE1239HILL
Ionisation Alarm with Lithium Battery
Hard wire interconnection
KE2239HI
Optical Alarm with Alkaline Battery
Hard wire interconnection
KE2239HILL
Optical Alarm with Lithium Battery
Hard wire interconnection
KE3239HI
Heat Alarm with Alkaline Battery
Hard wire interconnection
KE3239HILL
Heat Alarm with Lithium Battery
Hard wire interconnection
I240C
Ionisation Alarm with Alkaline Battery
Hard wire interconnection
PADC240
Optical Alarm with Alkaline Battery
Hard wire interconnection
KE4973
Optical Alarm with Alkaline Battery
Hard wire interconnection
KE4985
Optical Alarm with Lithium Battery
Hard wire interconnection
KE4899
Heat Alarm with Alkaline Battery
Hard wire interconnection
KE4892
Heat Alarm with Lithium Battery
Hard wire interconnection
KE4870
Ionisation Alarm with Alkaline Battery
Hard wire interconnection
KE4881
Ionisation Alarm with Lithium Battery
Hard wire interconnection

This is the technical data for the Mains Ionisation Smoke Alarm - Kidde Firex KF1.

Back-Up Battery KE4870: 9V Alkaline
KE4881: Longlife Lithium
Sound Output 85dB (minimum) at 3m
Temperature Range 5 to 40°C
Dimensions (HxDia) 38x138mm
Humidity Range Up to 93% Relative Humidity (RH)

Technical Data Sheets

The following technical data sheets are available for this product:

Q. Does the KF1 replace other Kidde alarms?

A. Yes, the the KF1 is the replacement smoke alarm for the 1275H, the 123i and the 4870 models.

Q. I purchased 4 alarms for my property recently via Safelinc's website. My electrician has installed them over the weekend.

However we have the following issue:

When you press the test button on the Carbon monoxide alarm the carbon monxide alarm goes off (but no alarm sound is heard on the other 3 connected smoke alarms).

This seems strange given that when you test any of the 3 smoke alarms, an alarm sound can be heard on the carbon monoxide alarm.

Is this meant to be like this?

The alarm models are:

1. Carbon Monoxide Firex 4985
2. Firex Ioisation 4881
3. Firex Ionisation 4870
4. Firex Optical 4985

A. The reason is the relevant British Standard which requires a different alarm sound for CO alarms in comparison to smoke alarms.

To achieve this, the CO alarm in question has a dual sound capability, meaning that

- if a smoke alarm is triggered or tested, the CO alarm detects that a smoke alarm has gone off and will activate one of its two internal sounders (sounding like a smoke alarm).

- if the CO alarm is tested or triggered, only the CO alarm sounds (sounding like a CO alarm). The smoke alarms are in this case not allowed to sound. As said above, this is a stipulation from BSI

Pricing & Availability

Model Stock Levels Prices Weight
Kidde KF1 - Alkaline Battery Backup
Product Code: KEKF1
In Stock

£14.79 ex VAT

(£17.75 inc VAT)

0.4kg

Kidde KF1R - Rechargeable Lithium Backup
Product Code: KEKF1R
In Stock

£26.19 ex VAT

(£31.43 inc VAT)

0.4kg

Customer Reviews

11/Mar/2014
Reviewed by:
Very easy to fit, works well.
18/Feb/2014
Reviewed by:
As the above
10/Nov/2013
Reviewed by:
First class service , easy to install product.
28/Sep/2013
Reviewed by:
Excellent product, easy to install and delivers the biscuit. First rate customer service. Prompt delivery.
25/Sep/2013
Reviewed by:
Good service

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