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

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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

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4.9 ★★★★★
Based on 20 reviews
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K
Verified Purchase
KCJamesThomson
Pawtucket, US
★★★★★ 5
Delicious, nice quality, small ground granule style dried garlic. Excellent product and price.
Size: 24 ounce (Pack of 1)
I see a lot of discussion over this product. Many loving it and many saying it is not granulated, but in the powder form. It IS indeed labelled Garlic Powder, but this is actually the granulated type, just very small granules. This is important because I like the granulated; I find the true powder form to be hard to work with and not as good tasting. This Amazon Grocery Garlic Powder is excellent, very fine quality, dried garlic into tiny granules. I'm very happy with this product.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 17, 2026
K
Verified Purchase
K. Kenneth
New York, US
★★★★★ 5
Reasonably priced garlic powder with no anti caking ingredients.
Size: 3.9 ounce (Pack of 1)
I like this garlic powder it is just like similar ones I purchased in the past. It has no additive so you get pure garlic powder there is no anti- caking agent. It is not like the store bought granulated garlic powder with anti-caking agents When you pour it out lightly tap it because it could come out fairly fast compared to the granulated garlic type. Whenever I get a chance I order a new one because this is flavorful. Just when I add it to Chicken fried I added on the top after cooking that and covering you don't want to burn it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 27, 2026
S
Verified Purchase
Stephanie
Fort Morgan, US
★★★★★ 5
Excellent value
Size: 24 ounce (Pack of 1)
Great quality garlic powder, excellent flavor. A great value!!! Highly recommend!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 29, 2026
I
Verified Purchase
Ivan
Draper, US
★★★★★ 4
Good 👍
Size: 24 ounce (Pack of 1)
Good garlic and the price is good
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 30, 2026
R
Verified Purchase
Reviewer
Belleville, US
★★★★★ 5
Amazon Grocery, Garlic Powder, 3.9 Oz. Nice Flavor, Free-Flowing. Tastes Great. A Good Value, too
Size: 3.9 ounce (Pack of 1), Size: 3.9 ounce (Pack of 1)
Amazon Grocery Garlic Powder, Amazon Grocery I purchased this Amazon Grocery Garlic Powder as a pantry staple for everyday cooking, and it has quickly become one of the seasonings I reach for most often. The garlic flavor is fresh, aromatic, and strong enough to add noticeable taste to meats, vegetables, soups, sauces, and marinades without needing to use a large amount. I appreciate that the ingredient list is simple and contains only garlic, which is exactly what I look for in a basic seasoning. The 3.9-ounce container is a practical size for regular household use. It stores easily in my spice cabinet and has been convenient to grab while cooking. It's enough to have on hand without going stale or clumping. I found the powder easy to blend into recipes, and it disperses well whether I am seasoning food before cooking or adding it during preparation. The flavor is consistent from use to use, which helps when following recipes. I also like the value this product offers. The price is reasonable compared to many similar garlic powders, yet the quality has been just as good as more expensive options I have tried. The garlic aroma is noticeable as soon as the container is opened, giving me confidence that the product is fresh. Versatile in that it can be used in many recipes calling for fresh garlic. Clean, natural appearance that looks like small garlic granules. One thing I noticed is that the shaker openings can dispense the powder fairly quickly, so I need to be careful when seasoning directly from the container. Aside from that minor issue, I have been very pleased with the flavor, convenience, and affordability. It has worked well in nearly every savory dish I have prepared. **Pros:** ✅ Pure garlic ingredient with no unnecessary additives ✅ Fresh, strong garlic flavor and aroma ✅ Good value for the price ✅ Convenient container size for everyday cooking ✅ Versatile for a wide variety of recipes ✅ Light yellow color and fine, consistent granule size and texture **Cons:** ❌ Shaker holes may dispense more powder than expected if poured too quickly ❌ Fine texture may not suit those who prefer coarser granulated garlic
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 2, 2026

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