Kidde Firex KF1 Ionisation Smoke Alarm
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Mains Powered Ionisation Smoke Alarm - Kidde Firex KF1

Discontinued Product

This product has been discontinued and is no longer available to buy.

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Product Overview

Kidde Firex KF1 and KF1R's are mains powered, interlinks 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 interlinked 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 interlinked 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, 1275H, 1275, Kidde i240C / 1240C and 1239HILLs and can be interlinked. However, the new models cannot be used on the old base plates and use different connector blocks. This means that base plates must be swapped over and connectors need to be replaced.


Interlink

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

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
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

Technical Data

This is the technical data for the Mains Powered 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)

Product Datasheets

The following datasheets are available for this product.

FAQs (2)

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

Customer Reviews

24 customers have rated this product and it has an overall rating of 4.7 out of 5

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

5 / 5 Stars

Reviewed by: -

EASY TO INSTALL

Published on: 25th September 2015

5 / 5 Stars

Reviewed by: -

Ideal replacement for my old alarms

Published on: 22nd August 2015

5 / 5 Stars

Reviewed by: -

It worked perfectly with the existing system and smoke alarm. Easy to fit too

Published on: 5th July 2015

4 / 5 Stars

Reviewed by: -

All good thanks.Would do business with you again

Published on: 25th May 2015

4 / 5 Stars

Reviewed by: -

Still alive Easy to install and I've not died in a fiery blaze. Can't find fault.

Published on: 28th March 2015

5 / 5 Stars

Reviewed by: -

Works well, keeps us safe We replaced an old set of these with new. The old and the new are the same size so easy to fit in which is a benefit. The old system worked well with few false alarms and the only alarms were when you would expect it. Luckily we've had no fires so it hasn't been tested in anger, but when the plumber was soldering that set it off so seems to work!

Published on: 13th December 2014

5 / 5 Stars

Reviewed by: -

Product delivered with slight delay, as advised to me due stock situation New design fitted easily into base plate of previous model. Tested it and my two linked, original units chimed in as before. My second experience of purchasing from Safelincs.

Published on: 19th November 2014

4 / 5 Stars

Reviewed by: -

KFI was a drop in replacement for 14 year old system-easy

Published on: 31st October 2014

4 / 5 Stars

Reviewed by: -

Good apart from plugs giving trouble Good apart from one thing. The units are fitted in a let property and it is a requirement that the tenants should replace the batteries when required. It is necessary to remove the interconnect plugs to do this. It is not possible for an inexperienced person to get the plugs out without doing some damage. They are a very tight fit and I had to use a small screwdriver to lever the plastic lugs apart and then withdraw the plug. This was not the case with the old ones which had been in use some 10 tears.

Published on: 9th August 2014

5 / 5 Stars

Reviewed by: -

Excellent cost effective solution for my rental property. Connected easily to other Firex Smoke and Carbon Monoxide alarms.

Published on: 29th July 2014

4 / 5 Stars

Reviewed by: -

Good product but no patress was disappointing I was replacing an earlier version of this product. On the plus side, it fitted existing fittings and was easy to install. Too soon to tell if it works as efficiently as the previous model but no reason to think otherwise. On the downside, no patress was supplied with the alarm. Although the new alarm fitted to the existing pattress it has discoloured over time and the looks of the alarm are spoilt by this. I didn't have the time to order patresses so I'll have to live with what I have for the time being (I'll probably not get round to replacing them now). I think you should consider supplying a patress as part of the alarm.

Published on: 8th June 2014

5 / 5 Stars

Reviewed by: -

Very easy to fit, works well.

Published on: 11th March 2014

5 / 5 Stars

Reviewed by: -

As the above

Published on: 18th February 2014

5 / 5 Stars

Reviewed by: -

First class service , easy to install product.

Published on: 10th November 2013

5 / 5 Stars

Reviewed by: -

Excellent product, easy to install and delivers the biscuit. First rate customer service. Prompt delivery.

Published on: 28th September 2013

4 / 5 Stars

Reviewed by: -

Good service

Published on: 25th September 2013

5 / 5 Stars

Reviewed by: -

I received exactly what I ordered in the time promised with no fuss.

Published on: 17th September 2013

5 / 5 Stars

Reviewed by: -

your product is Smokin!!!!

Published on: 9th August 2013

5 / 5 Stars

Reviewed by: -

Published on: 24th December 2012

4 / 5 Stars

Reviewed by: -

Purchased as a replacement for model 4870 which was faulty. I hope this new model will last longer.

Published on: 13th December 2012

5 / 5 Stars

Reviewed by: -

Published on: 24th April 2012

Customer didn't leave a rating

Reviewed by: -

I would have liked to had a direct replacement unit that matched my old smoke alarm so that it would have been easier to replace, however, the new smoke alarms were fairly easy to install. And delivery was excellent.

Published on: 4th April 2012

5 / 5 Stars

Reviewed by: -

Excellent product and does not go off when cooking like the old alarm did. Very easy to replace old alarm.

Published on: 19th February 2012

5 / 5 Stars

Reviewed by: -

Excellent Product, it is so easy ordering by the internet and the product arrived in good time. Very good service all round

Published on: 11th March 2011

5 / 5 Stars

Reviewed by: -

Have previously used same excellent product, now replacing after 5 years use.

Published on: 29th December 2010

Customer didn't leave a rating

Reviewed by: -

THE WHOLLE EXPERIENCE OF PLACING MY ORDER WAS EXCELLENT, PRICE VERY REAONABLE AND THE EXPANATION OF PRODUCT DETAILS ON THE SITE ASSURED ME THAT THE PRODUCT MET WITH MY NEEDS. THANKS

Published on: 1st October 2010

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Kidde 4870 smoke alarm battery replacement

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