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Mains Powered Optical Smoke Alarm with Back-Up Battery - Kidde Firex KF20
Product Overview
Please Note: The Kidde Firex KF20 (previously Kidde 4973 / KF2) and KF20R (previously Kidde 4985 / KF2R) are replacements for the Kidde 2239HI and 2239HILLs and can still be interlinked, however the new models cannot be used on the same base plates and use different connector blocks.
Interlink
Carbon Monoxide Alarms
Compatible Alarms
Technical Data
Show More
£17.75 inc VAT
£14.79 ex VAT
Mains Powered Heat Alarm with Back-Up Battery - Kidde Firex KF30
£28.79 inc VAT
£23.99 ex VAT
GP Long Life Lithium Battery
£7.74 inc VAT
£6.45 ex VAT
SMK4896 Surface Mounting Pattress for Firex Alarms
£6.23 inc VAT
£5.19 ex VAT
The updated Kidde Firex KF20 and KF20R alarms are mains powered, interlinking optical smoke alarms that use up to 70% less energy than previous Firex models. The KF20 has an alkaline battery back-up and the KF20R, a self-charging 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.
- Power: Mains powered with battery backup
- Backup Battery: 9V alkaline or self-charging longlife lithium backup options
- Warranty: 6 year warranty
- Up to 70% less energy consumption compared to previous Firex models
- A maximum of 24 units can be interlinked via signal cable
- Kitemarked to BS EN 14604: 2005 - view the certificate
- Suitable for installations complying to BS 5839-6: 2019 Grade D1 (KF20R) or Grade D2 (KF20)
- CE marked
- LED indicator
- Test / Hush button
- Low battery warning chirp - can be silenced for 8 hours
- Supplied with dust cover (to protect unit temporarily if you carry out dusty work)
- Supplied with fixings; 2 x screws and 2 x rawl plugs
Please Note: The Kidde Firex KF20 (previously Kidde 4973 / KF2) and KF20R (previously Kidde 4985 / KF2R) are replacements for the Kidde 2239HI and 2239HILLs and can still be interlinked, 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 interlink with the KF20 and KF20R.
Alarms from the same series|
Model Number
|
Type of unit
|
Type of interlink
|
| Optical Alarm |
Hard wire interlink
|
|
| Optical Alarm with Self-Charging Lithium Cell |
Hard wire interlink
|
|
| Heat Alarm |
Hard wire interlink
|
|
| Heat Alarm with Self-Charging Lithium Cell |
Hard wire interlink
|
|
| Ionisation Alarm |
Hard wire interlink
|
|
| Ionisation Alarm with Self-Charging Lithium Cell |
Hard wire interlink
|
|
|
KEKF2
|
Optical Alarm |
Hard wire interlink
|
|
KEKF2R
|
Optical Alarm with Self-Charging Lithium Cell |
Hard wire interlink
|
|
KEKF3
|
Heat Alarm |
Hard wire interlink
|
|
KEKF3R
|
Heat Alarm with Self-Charging Lithium Cell |
Hard wire interlink
|
|
KEKF1
|
Ionisation Alarm |
Hard wire interlink
|
|
KEKF1R
|
Ionisation Alarm with Self-Charging Lithium Cell |
Hard wire interlink
|
|
Model Number
|
Type of unit
|
Type of interlink
|
| CO Detector with Self-Charging Lithium Cell |
Hard wire interlink
|
|
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
This is the technical data for the Mains Powered Optical Smoke Alarm with Back-Up Battery - Kidde Firex KF20.
| Product Code |
|
||||
|---|---|---|---|---|---|
| Weight | 0.28kg | ||||
| Dimensions (HxDia) | 39x133mm | ||||
| Sound Output | 85dB (minimum) at 3m | ||||
| Temperature Range | 0° to +40°C | ||||
| Back-Up Battery | KF20: 9V Alkaline KF20R: Self-Charging Lithium |
||||
| Alarm Grade | KF20: BS 5839-6: 2019 Grade D2 KF20R: BS 5839-6: 2019 Grade D1 |
Product Datasheets
The following datasheets are available for this product.
Pricing & Availability
| Model | Stock | Price |
|---|---|---|
|
Kidde KF20 - Alkaline Battery Backup Product Code: KEKF20 |
Stock Level:
More than 20 in stock Expected dispatch: Today
|
Price:
£23.99 inc VAT £19.99 ex VAT |
|
Kidde KF20R - Self-Charging Lithium Battery Backup Product Code: KEKF20R |
Stock Level:
More than 20 in stock Expected dispatch: Today
|
Price:
£39.59 inc VAT £32.99 ex VAT |
Customer Reviews
15 customers have have given this product an overall rating of 4.6 out of 5
Reviews by real customers
All of our product reviews are written by real customers that have purchased this product from us and are published without modification.Rating: 5 / 5 Stars
Reviewed by: L C
Brilliant!! I forgot about the rice boiling on the stove. Alarm went off leaving me to clean off burnt on rice. Good I had this product.
Published on: 13th April 2018
Rating: 5 / 5 Stars
Reviewed by: K L
Good value product
Published on: 6th November 2017
Rating: 4 / 5 Stars
Reviewed by: J S
Replaced older model that had been very reliable. Hopefully this will be as reliable as the older version it replaced. Seems to be working as expected.
Published on: 20th August 2017
Rating: 4 / 5 Stars
Reviewed by: B S
Easy to fit, looks good Plug connector makes installation a little bit fiddly
Published on: 21st May 2017
Rating: 5 / 5 Stars
Reviewed by: K D
Good service, as always
Published on: 7th February 2017
Rating: 5 / 5 Stars
Reviewed by: G F
Easy to install, works perfectly.
Published on: 28th December 2016
Rating: 5 / 5 Stars
Reviewed by: J G
excellent
Published on: 27th December 2016
Rating: 5 / 5 Stars
Reviewed by: R M
Replaced old model 4985 with this, no problem
Published on: 11th November 2016
Rating: 5 / 5 Stars
Reviewed by: S S
Easy to fit.
Published on: 30th October 2016
Rating: 5 / 5 Stars
Reviewed by: D H
Easy to install, looks good.
Published on: 11th October 2016
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Mains Powered Heat Alarm with Back-Up Battery - Kidde Firex KF30
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GP Long Life Lithium Battery
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