I have a kf1r. whats the model to use that will fit the back plate. i also assume that the connectors are the same.

The KF1R is the 2nd generation and discontinued by the manufacturer. The compatible replacement for this is the KF10R. The KF10, KF10LL, KF10R, KF20, KF20LL, KF20R, KF30, KF30LL and KF30R all come with a mounting plate so can also be used as a replacement.

I have at the moment 2 kidde firex kf2 4973 fitted and one appears to be faulty. is this unit compatible as a replacement

As far as I can tell the KF20 is a direct replacement for the 4973, see this quote from an online seller :- " The Kidde KF20 / 4973 is a 230V Optical Smoke Detector with Alkaline Battery Back Up from the Kidde Firex range." The mains connector blocks look exactly the same. Hope that helps.

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Kidde KF20 Optical Smoke Alarm

Product ID: 52450656

Details

Alarm
Visual
Brand
Kidde
Colour
White
Global Trade Identification Number
Item weight
0.24 Kilograms
Material
Plastic

🔋9V battery backup

🔗Interlink up to 23 alarms

🛡️6-year manufacturer warranty

€ 62.18

Duties & taxes included

In stock

Sold byAmazon BelgiumDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Stay ahead of danger with Kidde KF20 — your smart shield against fire! 🛡️

CONNECTED PROTECTION - Interlink up to 23 Firex series alarms for seamless, whole-home fire detection coverage.
UNINTERRUPTED SAFETY - Mains powered with 9V alkaline battery backup ensures your home stays protected even during power outages.
USER FRIENDLY DESIGN - LED indicator, test and hush button, plus low battery warning chirp for effortless maintenance.
CERTIFIED RELIABILITY - CE and Kitemarked to BS EN 14604:2005, meeting the latest BS 5839-6:2019 Grade D2 standards.
HASSLE FREE INSTALLATION - Comes with screws and rawl plugs, plus a 6-year warranty for peace of mind and long-term safety.

The Kidde KF20 Optical Smoke Alarm is a mains-powered, photoelectric smoke detector with a 9V alkaline battery backup, capable of interlinking with up to 23 other alarms for comprehensive fire protection. Certified to the highest UK safety standards, it features an LED indicator, test and hush buttons, and a low battery warning chirp. Easy to install with included fixings and backed by a 6-year manufacturer warranty, it’s a reliable, professional-grade solution for modern homes.

Specifications

ASIN	B012CDAWPA
Alarm	Visual
Best Sellers Rank	33,418 in DIY & Tools ( See Top 100 in DIY & Tools ) 108 in Smoke Alarms
Brand	Kidde
Colour	White
Customer Reviews	4.6 out of 5 stars 461 Reviews
Global Trade Identification Number	00047871259717
Included Components	Smoke Alarm Mounting bracket 9V Alkaline battery
Item Dimensions D x W x H	13.5D x 5.5W x 13.5H centimetres
Item Type Name	Smoke Alarm
Item Weight	0.24 Kilograms
Item weight	0.24 Kilograms
Manufacturer	Kidde
Manufacturer Warranty Description	6 years.
Material	Plastic
Model Number	KF20
Number of Items	1
Part Number	KF20
Power source	Battery Powered
Product Style	Classic
Product dimensions	13.5D x 5.5W x 13.5H centimetres
Sensor Type	Photoelectric
Style	Classic
UPC	047871259717
Unit Count	1.0 count

Reviews

S**Y

Great

Perfect as fitted over the original base and so no unsightly mess. Sure they will be as effective as the old ones.

20.10.2026

S**T

Works Really Well

I had a similar one before and recently bought another because the old one kept beeping for some reason. I’m not sure if it had reached the end of its life or if there was another issue. Either way, this one works really well and I’m very happy with it.

9.08.2026

B**Z

Great

Great product

1.11.2026

R**D

Easy to fit smoke alarm

Not to hard to install as this was a replacement for my old smoke alarm just use the same wiring

10.12.2019

D**R

Kidde KF20 Optical Smoke Alarm

Excellent product and prompt delivery.

6.09.2026

A**R

Always may sure electrical connection is compatible and test alarm after installation

Fire alarm arrived next day and was easy to fit, just plugged into existing wiring

11.02.2026

C**O

Super

20.06.2026

D**V

works very well

9.02.2026

J**N

Alarm delivered fast and without problems

Alarm with installed in a previous installation without problems.

22.09.2020

E**N

Überwachung unerwünschter Rauche und somit Scutz vor Feuer.

Im System der Rauchmelderkette, technisch ausgereift.

8.03.2019

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TrustScore 4.5 | 7,300+ reviews

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€ 62.18

Duties & taxes included

In stock

Sold byAmazon BelgiumDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Belgium.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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2 days ago

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