WARDEN 4-IN-1 CO Detector
- Shows gas levels in real time
- Detects carbon monoxide, natural gas & propane
- Warns from as low as 30 PPM
- Early warning, not a last-minute alarm
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How do I install WARDEN — and what do I need to set it up?
Dead simple — no wiring, no electrician, no drilling required. And because you're ordering through our UK store, you get a UK Type G adapter included free with every WARDEN — no need to buy anything extra. That adapter alone retails at £29.99 on its own, but it's built specifically for WARDEN, so it comes bundled at no extra cost.
Setup is just: peel the backing off the mounting bracket, stick WARDEN to your wall or ceiling (or sit it on a shelf/tabletop), plug the adapter into your wall socket, then plug WARDEN into the adapter. Full 4-in-1 protection (CO, gas, temperature, humidity) in under 2 minutes.
Where's the best place to put WARDEN?
Kitchens and near boilers/gas appliances catch gas leaks fastest. Bedrooms and landings are ideal for CO, since it's most dangerous while you sleep. One WARDEN per level of your home gives the most reliable coverage.
What happens once WARDEN is plugged in — do I need to do anything else?
Nothing at all. WARDEN self-calibrates on power-up and runs continuously in the background — no apps, no pairing, no maintenance schedule to remember. If it ever detects a problem, the alarm and display do the talking.
Seven years on the job, and I've lost count of how many calls started the same way.
A family who had no idea CO was building up until someone was already unconscious. That's not a risk I'm willing to take with my own house. WARDEN gives me real-time readings and an early warning, not just a siren going off once it's already dangerous. For my family, that's non-negotiable.
CARBON MONOXIDE:
A LEADING CAUSE OF FATAL POISONING WORLDWIDE.
Around 40,000 die from CO poisoning yearly — often asleep, often with a "working" detector on the wall. Expired. Untested. Green light glowing as the room fills with gas. It comes from boilers, stoves, garages, generators. No smell. No sight. No sound.
Every Second Matters.
Standard detectors delay.
WARDEN acts the moment CO appears.
How it works
No batteries, no wiring. Just plug it in.
Live CO and gas levels shown on the display.
Alerts trigger early, well before symptoms set in.
WARDEN 4-IN-1 CO Detector
WARDEN is a professional-grade detector showing real-time CO, gas, humidity and temperature — starting at 0 PPM.
Set up in 30 seconds. No ladder, no tools, no electrician.
The moment CO or gas is detected, the red LED flashes and the alarm sounds:
"Dangerous gas detected."
No guessing. No delay.
The silent killer doesn't give warnings.
WARDEN does.
Firefighters. First Responders. Safety Officers.
They all trust WARDEN.
Firefighter
James Callahan
FRONTLINE PROFESSIONALFirefighter
James Callahan
I've seen what CO does to a family that had no warning. WARDEN is the first device I've trusted enough to put in my own home.
Detection, Identification & Monitoring Specialist
Daniel Okafor
GAS DETECTION EXPERTDetection, Identification & Monitoring Specialist
Daniel Okafor
Most detectors tell you there's a problem after it's already critical. WARDEN shows you the level as it builds, that's the difference between control and crisis.
Hazardous Materials Officer
Marcus Reid
HAZMAT CERTIFIEDHazardous Materials Officer
Marcus Reid
In hazmat situations, every second of delay is a second too long. WARDEN gives me live readings the moment I enter a scene.
Firefighter
James Callahan
FRONTLINE PROFESSIONALFirefighter
James Callahan
I've seen what CO does to a family that had no warning. WARDEN is the first device I've trusted enough to put in my own home.
Detection, Identification & Monitoring Specialist
Daniel Okafor
GAS DETECTION EXPERTDetection, Identification & Monitoring Specialist
Daniel Okafor
Most detectors tell you there's a problem after it's already critical. WARDEN shows you the level as it builds, that's the difference between control and crisis.
Hazardous Materials Officer
Marcus Reid
HAZMAT CERTIFIEDHazardous Materials Officer
Marcus Reid
In hazmat situations, every second of delay is a second too long. WARDEN gives me live readings the moment I enter a scene.
What Separates WARDEN From Cheap Detectors?
Trusted Where It Matters Most.
Built for homes that refuse to take chances.
Customer Satisfaction
98%
Verified buyer reviews
Return Rate
<0.7%
Industry leading
Setup Time
30s
No tools. No ladder.
Homes Protected
50,000+
And counting
.
RECOMMENDED BY 50,000+ HOMEOWNERS
I know what CO does. This is the first detector I've trusted enough to put in my own home. The live display changes everything.
Our old detector went off randomly at 3am for no reason. OneGuard has been running for 4 months. Not a single false alarm.
The sensitivity on this thing is impressive for a home device.
Replaced three separate detectors with this one unit.
We have a gas boiler and two young kids. This was a non-negotiable purchase.
Bought this after a neighbour had a CO scare. Plug it in and it immediately shows you what's in the air.
I didn't realise CO detectors could show you actual numbers. Seeing 0 PPM on the screen every morning genuinely gives me peace of mind.
Since we got the Warden, I actually sleep easier at night. Before I'd just hope everything was fine, now I know.
My wife wanted one after our neighbours had a CO scare. Now it's in the hallway and we glance at it over morning coffee, genuinely reassuring.
Honestly I never used to think about carbon monoxide. Having the Warden made me realise how much of a relief it is not carrying that in the back of my mind anymore.
The grandparents live with us too. The Warden gives the whole family peace of mind, not just us.
I was sceptical we 'needed' one. A week in and I wouldn't want to be without it.
Our first flat together, and the Warden was one of the first things we set up. Feels like a small building block for our home.
My partner travels a lot for work. When he's away, the Warden gives me a bit of security I didn't have before.
We've got an older gas boiler. Since installing the Warden, it's just not something we worry about anymore.
Setting up our first place together, safety wasn't something we'd really talked about, the Warden made it easy to just handle it.
It's become part of our routine, honestly. Neither of us thinks about it much day to day, which is exactly the point.
Exceeded my expectations
The quality and craftsmanship are outstanding. I've tried many alternatives, but this one truly stands out. I use it every day.
Exceeded my expectations
The quality and craftsmanship are outstanding. I've tried many alternatives, but this one truly stands out. I use it every day.
Exceeded my expectations
The quality and craftsmanship are outstanding. I've tried many alternatives, but this one truly stands out. I use it every day.
Exceeded my expectations
The quality and craftsmanship are outstanding. I've tried many alternatives, but this one truly stands out. I use it every day.
Exceeded my expectations
The quality and craftsmanship are outstanding. I've tried many alternatives, but this one truly stands out. I use it every day.
Exceeded my expectations
The quality and craftsmanship are outstanding. I've tried many alternatives, but this one truly stands out. I use it every day.
Frequently Asked Questions
Orders are processed within 1–2 business days. Delivery typically takes 4–8 days depending on your location. Once your order ships, you'll receive a tracking link by email.
Yes. If propane is your primary concern, place the device in a low outlet close to the floor — propane is heavier than air and sinks. CO, by contrast, distributes evenly throughout a room, so height doesn't matter for CO detection.
Most budget detectors only alarm at high CO levels — meaning you may have already been breathing contaminated air before any warning sounds. They also offer no visibility into current levels, no confirmation they're still working, and a simple on/off alarm with no detail.
WARDEN detects CO earlier, displays live readings at all times, monitors temperature and humidity, and alerts you when a replacement is due. The real question isn't about price — it's whether you want to know about a risk early, or only when it's already critical.
For CO detection, height makes no difference — carbon monoxide spreads evenly through the air. If you're primarily using it to detect natural gas, however, place it as high as possible, since natural gas rises.
The alarm reaches 85 dB — comparable to a blender or heavy traffic. It's designed to cut through sleep and get you moving the moment it matters.
Yes. WARDEN uses an electrochemical sensor — the same technology trusted by safety professionals. It's significantly more accurate than the cheap semiconductor sensors found in most budget detectors.
No. WARDEN uses advanced sensors and smart algorithms to distinguish between harmless, short-term CO fluctuations — like cooking on a gas stove — and genuinely dangerous CO buildup from a faulty heater or failing heat exchanger.