Mains Powered Heat Alarm - Kidde Firex KF3
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Mains Powered Heat Alarm with Back-up Battery- Kidde Firex KF3

Discontinued Product

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

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Product Overview
Kidde Firex KF3 and KF3R are mains powered interlinking heat alarms.  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.
  • 230V Hard-wired heat alarm
  • 9V Alkaline or Lithium back-up battery options
  • 6 year warranty
  • A maximum of 24 units can be interlinked via signal cable
  • Suitable for installations complying to BS 5839-6: 2013 Grade D, E and F
  • Kitemarked to BS EN 5446-2:2003
  • CE marked
  • LED display
  • Test/Hush button
  • Low battery warning chirp
  • Heat alarms reduce the number of false alarms
  • The units are ideal for kitchens and garages
  • Supplied with free dust cover (to protect unit temporarily if you carry out dusty work)

Please Note: The Kidde Firex KF3 (previously the Kidde 4899) and KF3R (previously the Kidde 4892) are replacements for the Kidde 3239HI  and Kidde 3239HILL can be interlinked however the new models cannot be used on the same base plates and use different connector blocks.

Interlink

The table below shows all the units that can interlink with the KE4899 (KF3) and KE4892 (KF3R).

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 Heat Alarm with Back-up Battery- Kidde Firex KF3.

Sound Output 85dB (minimum) at 3m
Temperature Range 5°C to 40°C
Dimensions (HxDia) 38x138mm
Back-Up Battery KE4899: 9V Alkaline
KE4892: 9V Lithium

Product Datasheets

The following datasheets are available for this product.

FAQs (1)

Q. How can we test the alarm to make sure it is working?

A. The manufacturer's recommendation is to test the alarm by pressing the test button. This will simulate a heat input at the heat sensor. You can also test it with a hair dryer but make sure that the hairdryer is kept away at a suitable distance from the alarm. Do not attempt to test the alarm by using open fire or excessive heat as this may damage the unit.

Customer Reviews

9 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: -

good product quick delivery

Published on: 13th November 2015

5 / 5 Stars

Reviewed by: -

Direct replacement for the same product that was past it's 10 Year life

Published on: 3rd November 2015

4 / 5 Stars

Reviewed by: -

Bought to interlink with KF2 smoke alarms and fits the part.

Published on: 5th July 2015

4 / 5 Stars

Reviewed by: -

Good quality, easy to use slightly expensive

Published on: 26th June 2015

5 / 5 Stars

Reviewed by: -

Great delivery service

Published on: 5th April 2015

5 / 5 Stars

Reviewed by: -

I already had an older model installed and was happy to find that the newer model was an exact fit. Up and on in minutes. Peace of mind for another load of years.

Published on: 19th March 2015

5 / 5 Stars

Reviewed by: -

Fit for purpose

Published on: 8th August 2014

5 / 5 Stars

Reviewed by: -

Tidy, discreet and cost effective.

Published on: 8th April 2014

4 / 5 Stars

Reviewed by: -

Straight forward to fit in old housing

Published on: 24th September 2013

Customer didn't leave a rating

Reviewed by: -

Easily installed, linked to existing smoke detectors without issue

Published on: 25th June 2012

Customer didn't leave a rating

Reviewed by: -

Great. Tested with a blowtorch (from a safe distance without melting it!), and it works like a charm. Put it in the kitchen and interlinked it with two Kidde 1275h ionisation alarms (checked with Kidde, and this is an OK combination even though it doesn't say so in the manuals). When they all go off it's absolutely ear-splitting! I feel reassured that I won't be burning to death at home, although I may have temporary hearing loss if there is a fire.

Published on: 5th July 2010

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Kidde 4899 heat alarm battery replacement

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