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10 Year Life Carbon Monoxide Alarm - Kidde K5CO

4.8 out of 5 stars
1 unit 2+ units 5+ units

£14.15 inc VAT

£11.79 ex VAT

£13.34 inc VAT

£11.12 ex VAT

£12.74 inc VAT

£10.62 ex VAT

Product Overview

The Kidde K5CO carbon monoxide alarm will protect you and your family from dangerous carbon monoxide gas, and features a 10 year sensor life. Supplied with 2 x Duracell AA alkaline batteries to power the unit, the K5CO carbon monoxide detector continuously monitors the CO levels detected within a room. These units can be wall mounted or free standing, and feature a 7 year manufacturer's warranty. The K5CO replaces its predecessor (5CO) and can be fitted to existing 5CO baseplates.

  • Required in homes with an open fire or gas appliances
  • Product Life: 10 years
  • Battery: 2 x replaceable Duracell AA alkaline batteries (included)
  • Warranty: 7 year warranty
  • Free-standing or wall mounted (plate and fixings supplied)
  • Audible low battery warning "chirp"
  • Test/Reset button, and status LED indicators
  • Loud 85db piercing alarm if CO is detected
  • Detector alarms from 50ppm
  • End of life warning signal as reminder of when to replace alarm
  • Dimensions (HxWxD): 73 x 127 x 39mm
  • Kitemarked to BS EN 50291-1:2018 (domestic use)
  • CE marked and UKCA marked
  • This alarm is also suitable for the updated 2022 Welsh legislation

Please note: the packaging may state "excludes batteries" but this is regarding the warranty period; the 5CO is supplied with the recommended batteries.

Technical Data
Product Code KEK5CO
Alternative Product Codes 5CO, KE5CO, K5CO
Brand Kidde
Battery Type

2 x AA alkaline batteries (Duracell included)

Dimensions (HxWxD)

73 x 127 x 39mm


LED status indicators

Operating Temperature

-10°C to 40°C

Relative Humidity

Up to 90% (non-condensing)

Sound Output

85dB (A) at 3 metres

Storage Humidity

5% to 95% RH (non-condensing)

Storage Temperature

-20°C to 60°C


7 years

Weight 0.25kg
Product Datasheets
FAQs (4)
Q. Where should I install my carbon monoxide alarms?

CO detectors should be installed near potential sources of carbon monoxide, essentially any fuel-burning appliances such as boilers, cookers and ovens, fireplaces (both open and enclosed burners), and portable generators. As you are likely to be most affected by CO in areas of your home that you spend the most time in it is advisable to install alarms in those areas as well, such as the living room and bedrooms. It is also worth noting that while one detector is better than no detectors at all, larger homes may require several detectors to cover the property fully.

Also note that carbon monoxide has been proven to spread into neighbouring properties through open windows and, in semi-detached or terrace houses, through loft spaces. If your property has an attached garage with a connecting door through to the house, it is recommended to fit a CO alarm inside the house leading from that doorway.

Battery powered carbon monoxide alarms can typically be installed wall-mounted or left free-standing on flat, level surface.

  • Near an appliance: they should be placed within 1 to 3 metres horizontally from the appliance and between the height of the appliance to 150mm below the ceiling – i.e., not above a stove where it would be in the path of steam or fumes.
  • In living spaces: they should be positioned close to where the occupant's head is likely to be most of the time – e.g., on your bedside table.

Combined smoke & CO alarms or mains-powered CO alarms are typically installed on the ceiling and should be at least 30cm away from any wall, light fitting, or other obstruction.

Do not install CO alarms within 3 metres of doors or windows, above radiators, or immediately close to anything that gives off steam or fumes like a cooker or shower room. Similarly, it is not recommended to install detectors in dusty areas such as workshops or garages.

For more information, please check the manufacturer's instructions – you can download the PDF manual from the relevant product page on our site. You can also watch our video guide to positioning CO detectors.

Q. What are the symptoms of carbon monoxide poisoning?

The symptoms of CO poisoning can range from mild flu-like symptoms such as headache, drowsiness, confusion, nausea and dizziness to more severe symptoms like breathing difficulties and irregular heartbeat. CO poisoning can ultimately lead to coma and death.

View more symptoms on our carbon monoxide information page.

Q. Where are carbon monoxide alarms required?

Most legislation advises at least one carbon monoxide alarm is fitted near new or replacement fuel-burning appliances that are fixed installations, though rented properties (both social and private sector) often require CO alarms be provided by landlords even if no appliances are being installed or replaced. Examples include boilers, coal fires, wood burners, and gas ovens and cookers, though an exception is often made in legislation for gas appliances solely used for cooking.

However, any and all materials can give off CO when burning, including gas cookers. Carbon monoxide can also spread from neighbouring properties or outside sources such as vehicle fumes. Because of this, Safelincs strongly recommends the installation of carbon monoxide detectors in every home, and also at head-height in bedrooms to protect occupants while sleeping.

Landlords, please see our pages for English, Welsh, and Scottish alarms or our landlord guidance page for more information.

Q. Can smoke alarms detect carbon monoxide gas?

No, normal smoke alarms cannot detect carbon monoxide (CO). Only combined smoke and CO alarms can detect both fire and carbon monoxide gas.

Key Product Features

Easy weekly testing at the press of a single button

LED indicators for alarm (red), power (green), fault (amber)

Safety clips prevent installation without batteries

Backplate functions as wall mounting bracket for installation

What's Included?

Every Kidde KEK5CO is supplied with the following components.

  • 1 x Kidde K5CO carbon monoxide alarm
  • 2 x AA batteries
  • 1 x Screw fixing set (screws & rawl plugs)
  • 1 x Instruction manual

Pricing & Availability

Model Stock 1 unit 2+ units 5+ units
Product Code: KEK5CO Stock Level:
More than 20 in stock Expected dispatch: 21st May
1 unit

£14.15 inc VAT

£11.79 ex VAT

2+ units

£13.34 inc VAT

£11.12 ex VAT

5+ units

£12.74 inc VAT

£10.62 ex VAT

Delivery Options

The following delivery options are available on this product.

Standard Delivery

£3.19 inc VAT - Orders will be delivered in 2-3 working days with Evri

Next Working Day Delivery

£6.19 inc VAT - Orders will be delivered the next working day with Evri

For dispatch today order within

Excellent Warranty

This product is supplied with a 7 year manufacturers warranty as standard

Customer Reviews

30 customers have given this product an overall rating of 4.8 out of 5

Reviews by real customers

All of our product reviews are written by real customers that have purchased this product from us and are published without modification.

Rating: 5 / 5 Stars

Reviewed by: M D


Published on: 27th February 2024

Rating: 5 / 5 Stars

Reviewed by: D M

Easy to set up and use Prompt delivery

Published on: 9th February 2024

Rating: 5 / 5 Stars

Reviewed by: F S

This product is robust and I feel safer with itI would recommend it to anyond I would recommend it to anyone

Published on: 19th January 2024

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