---
product_id: 52450656
title: "Kidde KF20 Optical Smoke Alarm"
brand: "kidde"
price: "$326702"
currency: COP
in_stock: true
url: https://www.desertcart.co/products/52450656-kidde-kf20-optical-smoke-alarm
store_origin: CO
region: Colombia
---

# 9V battery backup Interlinks with 23 alarms Includes mounting fixings Kidde KF20 Optical Smoke Alarm

**Brand:** kidde
**Price:** $326702
**Availability:** ✅ In Stock

## Summary

> 🔥 Stay Alert, Stay Safe! 🔥

## Quick Answers

- **What is this?** Kidde KF20 Optical Smoke Alarm by kidde
- **How much does it cost?** $326702 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co](https://www.desertcart.co/products/52450656-kidde-kf20-optical-smoke-alarm)

## Best For

- kidde enthusiasts

## Why This Product

- Trusted kidde brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safety First:** Mains powered with battery backup for ultimate peace of mind.
- • **Connect & Protect:** Interlink with up to 23 Firex alarms for comprehensive coverage.
- • **Certified Assurance:** CE and Kitemarked to BS EN 14604: 2005 standards.
- • **User-Friendly Design:** LED indicators and test/hush button for easy operation.
- • **Long-Term Reliability:** Comes with a 6-year manufacturer's warranty for your confidence.

## Overview

The Kidde KF20 Optical Smoke Alarm is a reliable mains-powered smoke detector featuring a 9V alkaline battery backup. It can interlink with up to 23 other alarms in the Firex series, ensuring comprehensive fire protection throughout your space. With CE and Kitemarked certifications, this alarm meets stringent safety standards. It includes user-friendly features like LED indicators and a test/hush button, and comes with a 6-year manufacturer's warranty for added peace of mind.

## Description

KiddeKF20 Optical Smoke Alarm

## Features

- Mains powered smoke alarm with 9 volt alkaline battery back-up.
- Interlink with up to 23 other alarms in the Firex series to create all round fire protection.
- CE marked and Kitemarked to BS EN 14604: 2005 and suitable for installations complying to BS 5839-6: 2019 Grade D2.
- LED indicator, test and hush button, low battery warning chirp.
- Supplied with fixings; 2 x screws and 2 x rawl plugs and has a 6 year manufacturer’s warranty

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Kidde |
| Part number | KF20 |
| Item Weight | 240 g |
| Product Dimensions | 5 x 13.5 x 13.5 cm; 240 g |
| Batteries | 1 Product Specific batteries required. (included) |
| Item model number | KF20 |
| Colour | White |
| Style | Classic |
| Material | Plastic |
| Power source type | Battery Powered |
| Item Package Quantity | 1 |
| Number of Pieces | 1 |
| Measurement System | Metric |
| Included components | Smoke Alarm Mounting bracket 9V Alkaline battery |
| Batteries included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |

## Product Details

- **Brand:** Kidde
- **Style:** Classic
- **Power source:** Battery Powered
- **Colour:** White
- **Product dimensions:** 13.5D x 5.5W x 13.5H centimetres
- **Item weight:** 0.24 Kilograms
- **Alarm:** Visual
- **Sensor type:** Photoelectric
- **Global Trade Identification Number:** 00047871259717
- **Material:** Plastic

## Images

![Kidde KF20 Optical Smoke Alarm - Image 1](https://m.media-amazon.com/images/I/71HXHWTdaZL.jpg)

## Questions & Answers

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

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

**Q: what new model has replaced the old Firex 120-1125E please?**
A: This is the replacement

**Q: Can this replace a kf10**
A: Yes it can

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*Product available on Desertcart Colombia*
*Store origin: CO*
*Last updated: 2026-02-28*