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Description
Kidde Sentry 4x KF21 Optical Smoke & 1x KF31 Heat Alarm Kit Mains Powered with 9V Alkaline Battery Back-Up c/w Quick Fit BaseKidde Sentry 4x KF21 Optical Smoke & 1x KF31 Heat Alarm Kit with 9V Battery Back Up The Kidde Sentry Alarm Kit includes four KF21 Optical Smoke Alarms and one KF31 Heat Alarm, providing a complete mains powered fire detection solution for larger residential properties. Designed to deliver reliable smoke and heat detection throughout the home, each alarm features a 9V alkaline battery back up and can be interconnected with up to 23 compatible Kidde
Kidde Sentry 4x KF21 Optical Smoke & 1x KF31 Heat Alarm Kit with 9V Battery Back-Up
The Kidde Sentry Alarm Kit includes four KF21 Optical Smoke Alarms and one KF31 Heat Alarm, providing a complete mains-powered fire detection solution for larger residential properties. Designed to deliver reliable smoke and heat detection throughout the home, each alarm features a 9V alkaline battery back-up and can be interconnected with up to 23 compatible Kidde FIREX alarms.
This interlinked alarm system ensures that when one alarm detects danger, all connected alarms sound simultaneously, helping to provide earlier warning and improved occupant safety across multiple rooms and floors.
Each alarm is supplied with Kidde’s Quick-Fit Slide-On Base for faster installation and includes integrated cable management to maintain neat, secure wiring. The 150mm flared base plate also provides a clean retrofit finish when replacing existing alarms.
Kit Contents
- 4 x Kidde KF21 Optical Smoke Alarms
- 1 x Kidde KF31 Heat Alarm
KF21 Optical Smoke Alarm Features
The Kidde KF21 optical smoke alarm is ideal for detecting slow, smouldering fires caused by electrical faults, furniture or cigarettes. Suitable for escape routes and living spaces, the optical sensor 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 activated alarm
- Combined Test/Hush button
- Auto reset after activation
- Tamper-resistant locking mechanism
- Suitable for hallways, bedrooms, lofts and living areas
- BSI certified to BS EN14604:2005
- 10-year warranty
KF31 Heat Alarm Features
The Kidde KF31 heat alarm is designed for kitchens, garages and loft spaces where smoke alarms may be unsuitable due to steam, dust or cooking fumes. Its thermistor heat sensor provides reliable temperature detection while helping reduce nuisance alarms.
- Mains-powered heat alarm with 9V alkaline battery back-up
- Thermistor heat sensor for dependable heat detection
- Interconnects with up to 23 Kidde FIREX alarms
- Alarm memory identifies the activated alarm
- Combined Test/Hush button
- Auto reset after activation
- Tamper-resistant locking mechanism
- Ideal for kitchens, garages and loft spaces
- BSI certified to BS 5446 Part 2:2003
- 10-year warranty
Key Benefits
- Complete smoke and heat alarm solution for larger homes
- Interlinked alarms provide whole-home warning when danger is detected
- Quick-Fit bases for fast and efficient installation
- Integrated cable management for tidy wiring
- Suitable for compliance with UK Building Regulations
- Grade D domestic 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.
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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
4.1 ★★★★★
Based on 20 reviews
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Product Reviews
★★★★★ 3
So close to being good
I really wanted to like this book. It had all the makings of a strong, interesting story, but the plot got so convoluted that it was hard to follow. Also, for a "badass" FMC, Milla was amazingly inept. The writing got really stilted at times too. I will probably still read the next one anyway, because I'm curious to see where the plot goes.
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Reviewed in the United States on May 3, 2024
★★★★★ 5
FASCINATING world, great characters and swoony slow burn!
House of Bane and Blood by Alexis Menard
-Order and Chaos Book 1-
4.5/5⭐️
1/3🌶️*
2/3🦋
•My Thoughts•
What a RIDE! This world was absolutely fascinating with its 1920s mafia vibes meets magic. The characters and enemies to lovers storyline hooked me from the beginning - add in a marriage of convenience and a dash of mystery and I ate👏🏻it👏🏻up👏🏻. Milla’s growth was so good and I was cheering for her as she became more confident! I also loved Niko and his back story and resilience. These are imperfect characters you find easy to love, root for and I became enamored with their slow but steadfast (if reluctant) support of each other. I did find the government structure a little confusing but didn’t want to slow down enough stop and figure it out (if anyone reads it an wants to make a chart, please share it with me). This book was violent but also mesmerizing and full of hope for a better future. I loved the big family dynamics and the never ending plot twists that kept me guessing. This is a completed duology and with that ending, you BET I’m immediately reading book 2.
*I rated this a 1/3🌶️ because there were only a few scenes with on page intimacy. However, I would like to note that the spice involves kink: breath play.
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Reviewed in the United States on June 10, 2024
★★★★★ 4
Top tier romantasy
I really enjoyed this book! It's everything a romantasy should be, really. The interactions between the characters was good, the world was interesting, and I liked the magic system. Slow burn was a 10/10! I really love Nico. He's so intriguing and I hope we get more of his POV in the next book.
Reasons for taking off a star:
1. I didn't think the world building was set up well. I got the full picture by the end, but the author writes as if we should already understand and it was a bit confusing for quite a while.
2. Milla's characterization was inconsistent. She was wishy washy with her goals and didn't give off the bad ass vibes I think the author was aiming for. I would have also liked more showing and not telling for her background.
3. (This is me being a bit ridiculous) I didn't know if I was supposed to pronounce it as "Mih-luh" or "Mee-luh." I think the former sounds silly but my brain didn't want to read it as the latter 😅
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Reviewed in the United States on November 7, 2023
★★★★★ 5
Give me a little bit’a that Nicolai Roman Attano ANY DAY. 🥵
⭐️ 5
🌶 3
🚂 Peaky Blinders Vibes
🚂 Enemies to Lovers
🚂 Sexy + Sassy Banter
🚂 Marriage for Business
🚂 Unique Magic System
🚂 Dual POV
I absolutely LOVED this book. The mafia/peaky blinders vibes — the lil’ steam punk feel mixed with magic and mayhem… add in the witty banter from Milla and Nico? ALEXIS, YOU DONE JUST ROCKED MY WORLD, FRIEND.
What I Enjoyed:
Nicolai. Roman. Attano.: Literally. This is all I’ve got to say to you, just read the book.
The Banter: When I tell you the banter between Milla and Nico is iconic — I mean it. Scroll down for some of my favorites, but my my my, my core was HEATING and I was wriggling in my seat on the airplane, my friends. OOOOOMPH.
Steampunk/ Peaky Blinders Vibes: I read this whole book with a feeling of mist on the ground, the flickering street lights, sound of a train horn, flapping of coat tails, and smell of cigarillo smoke. It was dark, broody, beautiful, and chilling. Add in a little wetness from morning dew and the scene has been set.
Plot Twists & Turns: The amount of times my eyes bugged out of my head with “OMG NO WAY”, “WHAAAT”, and “BOOIIIIIII–” should almost be illegal. I didn’t see the twist at the end coming, I loved it! Brilliant! I feel like House of Bane and Blood didn’t even allow me the opportunity to guess what would happen next, because I just had no idea where Alexis would take it.
Attano Family: I’m a sucker for a big family with many cousins, personalities, and a spicy Nonna. Throw in a kitchen scene or two and you’ve got me hooked. I loved the dynamic between the Attano family and how fast they came to bat for Milla. I throughly enjoyed getting to know the people behind Nicolai, and how they all support him and each other.
What I Didn’t Like:
The Minimal Insight on the Marchese Family: We aren’t really given much insight into the Marchese Family and Milla’s brothers. I understand this gives an ominous feel to the brothers — but I really wish we could have explored Giles and Milla’s relationship just a little bit more. I wish I understood more about the Twins than what was given. Although, I do understand the distance and the coldness, I personally just wanted a little more.
Over All Thoughts
The way I straight flew through this book — UGH. Adding Nico to my list of book boyfriends, and Alexis to my list of instant buy Authors. The way House of Bane and Blood is written is beautiful, it does not feel immature or overwhelming, there’s enough to keep you riveted and more and more unfolds with every chapter. Milla and Nico are a force to be reckoned with separately, but together? Indestructible! I cannot WAIT to see what happens in City of Mirth and Malice.
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Reviewed in the United States on July 9, 2024
★★★★★ 4
A Promising Start with a Complex Magic System
“House of Bane and Blood” delivers an engaging enemies-to-lovers romance wrapped in an arranged marriage trope, which was one of the strongest aspects of the book. The dynamic between Nico and Camilla was compelling, making their evolving relationship one of the highlights of the story. The plot itself was interesting and had a lot of potential.
However, the complexity of the magic system was a drawback. The abundance of difficult names and terms made it challenging to fully grasp the world-building, leaving some aspects feeling more confusing than immersive. At times, it was hard to keep track of what was happening and who was who.
Despite this, the book holds promise as the first installment of the series. With an intriguing setup and strong character chemistry, I’m excited to see where Book 2 takes the story. Hopefully, it will continue to build on its strengths while offering more clarity on its magical elements.
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Reviewed in the United States on March 17, 2025
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