Kidde Firex KF3 & KF3R Heat Alarms

Kidde Firex-KF3-KF3R

Product Features

  • Single 'Hush' and 'Test' button
  • C hoice of sealed-in rechargeable (three Panasonic lithium cells) or loose battery back-up ranges
  • Cable harness type connection and interconnectable up to 24 units
  • Supplied with base-plate
Delivery options

At Cadmus Products we aim to deliver orders efficiently and at highly competitive rates. 

  • We can ship consignments of all shapes and sizes and hazardous content across the UK and worldwide. Most of our orders are sent via DHL, however sometimes we may use other couriers.
  • If you are purchasing a laboratory product online you can find out the price of shipping checkout. If you are obtaining a quote for a product, then we will email you
    with our best shipping prices along with your quote.
  • Please see our delivery page for full information
Kidde's Firex range are hardwired smoke and heat alarms which have a 6 year guarantee and are BSI kitemarked therefore ensuring that level of quality would be consistent as it provided by the world's largest manufacturer. Ionisation and optical models have proven to be exceptional alongside heat alarms for situations which would prove to be unsuitable for smoke alarms such as kitchens and garages.


Both models are mains powered with a built in back-up power, thereby complying with a given set of instructions and minimum requirements for the relevant building regulations for new housing i.e. Grade D (BS5839, Part 6).

These models are particularly used in humid or dusty environments wherein smoke alarms fail to operate satisfactorily. For example kitchens, boiler rooms, unconverted garages. They are triggered immediately when the ambient temperature reach 57 degC and must always be interconnected with smoke alarms from the same product range.
  • KF3 - Heat AC with alkaline back-up
  • KF3LL - Heat AC with long-life lithium battery
  • KF3R - Heat AC with sealed-in rechargeable back-up
  • REMTH - Wired remote test & hush accessory switch for Firex
  • SMK23U - Universal surface mount kit for retrofits
  • SMK23RU - Same as SMK23U with 8 amp relay output pulse - switchable
  • SMK4896 - Firex only pattress
Colour Black
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