Check These Things Before Buying a Carbon Monoxide Alarm

It's worth a look if you have a small room with a boiler or stove. Stove placement is covered in the small electric heater placement article, and the number and position of smoke detectors in the fire detector article. This article sets out only the criteria for choosing the carbon monoxide alarm itself.

Where in the home does carbon monoxide come from?

The National Fire Agency explains that carbon monoxide forms when carbon-containing materials burn incompletely. For causes in the home, it names gaps in boiler and stove flues, gas leaks from a cooking gas range, and a wood-fired ondol room. Gas leaks from an instant water heater are also listed among other causes.

It starts with headache, dizziness, and nausea. The National Fire Agency says that if it gets worse, it can lead to vomiting, difficulty breathing, numbness in the hands and feet, and general weakness. If you have these symptoms, ventilate right away and call 119.

The Ministry of the Interior and Safety material (2022) sums up the five years from 2017 to 2021 as 21 gas boiler accidents and 46 casualties (17 deaths, 29 injuries). Of these, 45, all but one gas explosion injury, were carbon monoxide poisoning. The same material advises checking before you turn on the boiler that the exhaust pipe hasn't come off and that the piping isn't dented, and placing an alarm that detects carbon monoxide leaks indoors.

What should you check before you buy?

There are four things to check.

1. Fire-type approval mark: Kiturami advises that when buying individually, you choose a product with type approval from the Korea Fire Institute, the responsible testing body for fire safety products. The same material says KC certification for the battery and KC certification for electromagnetic compatibility have nothing to do with carbon monoxide detection performance, and tells you to confirm the exact certification information on the detail page.
2. Sensor type: Both manufacturers say they use an electrochemical sensor. Senko explains that it reduces interference from gases other than carbon monoxide, so there are fewer false alarms.
3. Power type: There are plug-in types and battery types. Of the 14 the Korea Consumer Agency tested, 13 were battery-powered.
4. Installation guide and user manual: In the Korea Consumer Agency survey, 3 of 14 products (21.4%) gave installation position guidance, and 7 (50.0%) came with a user manual. Check on the sales page whether the box includes these two.

How do you read the alarm concentration figures?

In its 2019 test, the Korea Consumer Agency looked at alarm performance under two standards. The standards and dates differ by source, so don't put them on the same line and compare them.

Checked on 2026-10-12. The test covered 14 products, and the Consumer Agency said the Korean standard did not apply to battery-powered types at that time. When tested to the European standard, 13 (92.9%) failed to operate at 50ppm or 100ppm or didn't sound within the set time. Because this is 2019 material, check separately with the National Fire Agency or the Korea Fire Institute whether the standards have changed since.

What differs between the two models in the published listings?

These are two models on Coupang's best-selling carbon monoxide alarms screen for which I could confirm official manufacturer material. I lined them up under the same headings.

Checked on 2026-10-12. For Kiturami I used the official December 2024 press release, and for Senko the text of the Senko Mall product description. The numerical items in the Senko Mall description couldn't be confirmed as text. The Kiturami press release doesn't say how many minutes the set time is, so you can't compare response speed from the alarm concentration figure alone. This table copies what the manufacturers published, not test results for the two models. Some SI-611 sales page titles are written for camping, so check in the manual that it fits the use of the room you'll install it in. Contents and specs on sales pages may change.

Where should you put it?

Position differs by model, so the manual takes priority. The Korea Consumer Agency pointed out that installing one in an unsuitable place, such as near the floor, a window, or a ventilation fan, can keep the alarm from sounding or delay it. It also said that as of 2019 Korea had no installation standard suited to housing structures. This article doesn't set numbers like a height in cm; follow the product manual.

Who is each model right for, and who is it wrong for?

The Kiturami KGD-500B suits you if:

• You don't want to use an outlet and want to put it wherever you like in the room.
• You want to choose by numerical listings such as operating temperature and humidity range and alarm concentration.

The Senko SI-611 suits you if:

• You want a product whose sensor the manufacturer made itself.
• You put the fire-type approval mark and the manufacturer's official mall sales information ahead of numbers.

Neither model suits you in one case. That is if you want it to take the place of a smoke detector. Both products react to carbon monoxide, so don't expect them to alert you to fire smoke. If a room has no fuel-burning appliance at all, first check whether it matches any of the causes the National Fire Agency lists.

What should you check before you order?

• That the model name on the sales page is the same as KGD-500B or SI-611
• That the product information carries the Korea Fire Institute type approval mark (a separate item from the battery and electromagnetic KC marks)
• Whether the power is battery type or plug-in type, and whether batteries are included
• That the box contains a manual with installation position guidance
• Whether the room where you'll put it has a cause such as a boiler or stove flue, a gas range, or a water heater