SKU: 18187191542

Kidde Sentry 1x KF21 Optical Smoke & 1x KF31 Heat Alarm Kit Mains Powered with 9V Alkaline Battery Back-Up c/w Quick Fit Base

$52.70 $58.56
Save 10%
No.2 Bestseller on mapetitemediatheque.fr >

Pay in installments of $14.64 with ShopPay, AfterPay and Klarna

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Aug 17 - Aug 22

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

Description

Kidde Sentry 1x KF21 Optical Smoke & 1x KF31 Heat Alarm Kit Mains Powered with 9V Alkaline Battery Back-Up c/w Quick Fit BaseKidde Sentry KF21 & KF31 Mains Powered Smoke and Heat Alarm Kit with 9V Battery Back Up The Kidde Sentry Alarm Kit combines the reliable KF21 Optical Smoke Alarm and KF31 Heat Alarm to provide comprehensive fire detection throughout residential properties. Designed for mains powered installation, both alarms feature 9V alkaline battery back up protection and can be interconnected with up to 23 compatible Kidde FIREX alarms for complete home safety

Kidde Sentry KF21 & KF31 Mains Powered Smoke and Heat Alarm Kit with 9V Battery Back-Up

The Kidde Sentry Alarm Kit combines the reliable KF21 Optical Smoke Alarm and KF31 Heat Alarm to provide comprehensive fire detection throughout residential properties. Designed for mains-powered installation, both alarms feature 9V alkaline battery back-up protection and can be interconnected with up to 23 compatible Kidde FIREX alarms for complete home safety coverage.

This convenient alarm combination is ideal for meeting UK Building Regulations in domestic properties, offering dependable smoke and heat detection across living spaces, hallways, kitchens, garages and loft areas.

Each alarm is supplied with Kidde’s Quick-Fit Slide-On Base for faster installation, while integrated cable management keeps wiring neat and secure. The 150mm flared base also provides a tidy finish when replacing existing alarms.

Kit Contents

  • 1 x Kidde KF21 Optical Smoke Alarm
  • 1 x Kidde KF31 Heat Alarm

KF21 Optical Smoke Alarm Features

The Kidde KF21 optical smoke alarm is designed to detect slow, smouldering fires commonly caused by furniture, electrical faults and cigarettes. Ideal for escape routes and living areas, the alarm provides dependable early warning protection.

  • Mains-powered optical smoke alarm with 9V alkaline battery back-up
  • Optical sensor with dust compensation and bug screen
  • Interconnects with up to 23 Kidde FIREX alarms
  • Alarm memory identifies the triggered unit
  • Combined Test/Hush button
  • Auto reset after activation
  • Tamper-resistant locking mechanism
  • Suitable for hallways, bedrooms, lofts and living rooms
  • BSI certified to BS EN14604:2005
  • 10-year warranty

KF31 Heat Alarm Features

The Kidde KF31 heat alarm is ideal for kitchens, garages and loft spaces where smoke alarms may be affected by steam, cooking fumes or dust. The thermistor heat sensor provides reliable temperature detection without nuisance alarms.

  • Mains-powered heat alarm with 9V alkaline battery back-up
  • Thermistor heat sensor for reliable heat detection
  • Interconnects with up to 23 Kidde FIREX alarms
  • Alarm memory identifies the triggered unit
  • Combined Test/Hush button
  • Auto reset after activation
  • Tamper-resistant locking mechanism
  • Ideal for kitchens, garages and humid environments
  • BSI certified to BS 5446 Part 2:2003
  • 10-year warranty

Key Benefits

  • Complete smoke and heat detection solution for residential properties
  • Interlinked alarms provide whole-home warning when danger is detected
  • Quick-Fit bases for fast and clean installation
  • Integrated cable management for tidy wiring
  • Suitable for compliance with UK Building Regulations
  • Grade D fire alarm system solution
  • Fully compatible with Kidde FIREX smoke, heat and CO alarms

Technical Specifications

KF21 Optical Smoke Alarm

  • Model: KF21
  • Power Supply: 230V mains with 9V alkaline battery back-up
  • Sensor Type: Optical
  • Alarm Volume: 85dB minimum at 3 metres
  • Dimensions: 150mm x 53mm
  • Weight: 295g
  • Operating Temperature: -10°C to +40°C
  • Warranty: 10 Years

KF31 Heat Alarm

  • Model: KF31
  • Power Supply: 230V mains with 9V alkaline battery back-up
  • Sensor Type: Thermistor heat sensor
  • Alarm Volume: 85dB minimum at 3 metres
  • Dimensions: 150mm x 150mm x 66mm
  • Weight: 281g
  • Operating Temperature: -10°C to +40°C
  • Warranty: 10 Years

Please Note: Alarms are supplied individually within the kit. Installation should be completed by a qualified electrician.

Downloads

KF21 Data Sheet:
Download KF21 Data Sheet

KF31 Data Sheet:
Download KF31 Data Sheet

KF21 Instruction Manual:
Download KF21 Instruction Manual

KF31 Instruction Manual:
Download KF31 Instruction Manual

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 18187191542

Discover Niche Categories That Outsell

Top-Converting Item to Boost Your Average Order

4.1 ★★★★★
Based on 11 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
S
Verified Purchase
SantaBGirl
Waukegan, US
★★★★★ 5
LOVE this frother and the creamy results!
Color: Black
I LOVE this gadget! And I'm not a gadget person. Since I got it a few days ago, I've switched from using my Nespresso coffee maker, which uses pods and which I really like, to using Starbucks instant coffee packets (cheaper and more environmentally friendly than pods). I put a packet of the coffee and two packets of Equal in a cup, add half and half, then use this frother to mix them. Within a few seconds -- no more than 5, if that -- I have a thick mound of creamy froth. Then I had the water to finish making the coffee. Fantastic. This thing is so easy and fun to use. This is not the cheapest frother available. I wanted a rechargeable unit that has sufficient power to make nice, creamy froth. Also, I didn't want to spend $10 and have the thing break and have to replace it. Reviews suggest the cheaper ones are fine if you don't regularly use a frother. I never used one before and didn't really think I would use it very often. But I like it so much, I've been using it twice a day. Also, I first saw one in use while traveling in India. Another guest at my small hotel had one, which she used to make a latte with rather than drink the rather tepid offering at the more tea-oriented hotel. That's when I decided to get one. I'll be taking it on future trips. Some come with travel containers; this one didn't. The only learning curve was making sure the cup or pitcher for the cream is deap enough not to splash out the cream. I think I'm actually using a little less cream than I used to because the volume increases so much. I use cold cream, not heated (I used to heat it in the microwave when I was using the NesPresso.) I find I like the initial contrast with the cold cream at the top, then I stir it down into the coffee. The Starbucks coffee is excellent. I've used it for iced lattes in the past, so I knew it was good. I can hardly wait for a heat wave to make them with this frother. I did try to beater attachment in eggs when I was making an omelet. Not worth the trouble -- first, the bowl I was using to beat the eggs was too shallow and egg got all over. Second, a fork works just as well. If I were whipping cream, I would definitely use it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 7, 2026
A
Verified Purchase
Amanda Gilmore
Phoenix, US
★★★★★ 5
Best frother ever
Color: White
This brother is wickedly powerful you don't need to use it for very long to get phenomenal frothing results Incorporates ingredients quickly
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 16, 2026
G
Verified Purchase
GoGreen
Lowell, US
★★★★★ 5
Works great and so much fun!
Color: Black
How did I live without this for so long? I love this little gadget! It gets used multiple times a day. It's not only great for frothing milk but it will whip eggs for a recipe and stir other ingredients as well. People who have complained that the stirring attachment was missing a piece did not read the description. The picture clearly shows there is no "boot" on that attachment, you don't want that one to spin like the frother. The Frother holds a charge for quite a while as well. I use mine multiple times a day and it is still holding a charge after weeks of daily use. Great item!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 15, 2026
N
Verified Purchase
Nick
San Leandro, US
★★★★★ 3
Disappointed
Color: White, Color: White
Powerful, but the description differs from the actual specifications, and the speed cannot be adjusted.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 15, 2026
B
Verified Purchase
Beach Dreamer
Pawtucket, US
★★★★★ 5
The perfect whipper for protein powders
Color: Blue
Love, love this whipper. Had to finally replace my old one that I got several years ago that was battery operated. This rechargeable replacement is incredible. Thought I would miss my old one, but no. The 3 interchangeable attachments make it my go to for a ton of things. Perfect for mixing protein powders!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 23, 2026

recommand products

Garnet Mixed Astrophyllite Sphere Ball Wholesale
98.00
VERSACE EROS FLAME by Gianni Versace DEODORANT SPRAY 3.4 OZ
120.14
High Quality Blue Caribbean Calcite Bracelet Wholesale
32.00
Origins by Origins Clear Improvement Active Charcoal Mask To Clear Pores--30ml/1oz
34.64
Howlite Pug Dog Carving Wholesale
24.00