Is Your Home Truly Safe From Invisible Toxic Leaks?

HOSFU is an easy-to-use, 4-in-1 CO & gas detector that shows you real-time danger levels — so you can protect your loved ones from hidden leaks before it’s too late.

check_circle Real-Time Digital Display — Don't wait for a blind alarm to sound. See exact Carbon Monoxide (PPM) and Natural Gas (%LEL) levels instantly, alongside room temperature and humidity.

check_circle Zero-Hassle Plug & Play — No drilling, no wiring, and no expensive electricians. Simply plug it into any standard wall outlet and you are protected in seconds.

check_circle 85dB Siren for Total Security — Loud enough to wake the deepest sleepers. Perfect for protecting elderly parents, kids, and everyone under your roof during winter heating.

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Note: Not Available on Amazon or eBay

" In all my years as a firefighter, the calls that haunt me the most aren't the massive blazes. It's the silent ones. Carbon monoxide (CO) is one of the leading causes of accidental poisoning deaths across Europe. Every single year, hundreds of people lose their lives to CO poisoning, and tragically, most of them pass away while they are sound asleep.

But do you want to know the real heartbreak we find when we arrive on the scene? Almost every single victim had a 'working' detector hanging on their wall. The green indicator light was still glowing. But the device was dead silent. Not a single alarm went off.

CO seeps from the everyday appliances keeping your home warm: heating boilers, furnaces, water heaters, and gas stoves. You can't see it. You can't smell it. You just don't wake up. "

Thomas Becker

Professional Firefighter

As Seen On

As Seen On

Smart Protection. Simplified.

A brilliantly designed 4-in-1 device that continuously monitors your home's air. It tracks Carbon Monoxide and Natural Gas in real-time, while keeping you beautifully informed of your room’s temperature and humidity at a single glance.

We believe home security shouldn't be complicated. Just plug HOSFU directly into any standard outlet. No messy wires, no complicated setups, and no drilling required. You get instant, reliable protection from the moment it powers on. Breathe easier. Sleep better. HOSFU watches over your home so you don't have to.

Invented By First Responders. Built To Save Lives.

HOSFU was invented and developed by first responders who saw the same tragedy repeat itself every winter — families with basic, "working" alarms that never gave them the early warning they desperately needed.

check_circle CE Certified — Meets the strictest safety, health, and environmental protection requirements for European homes.

check_circle Professional-Grade Sensors — Powered by highly accurate electrochemical technology to detect threats instantly.

check_circle 4-in-1 Real-Time Tracking — Independently tested to monitor Carbon Monoxide, Natural Gas, Temperature, and Humidity.

HOSFU isn't just another basic, blinking detector. It's the advanced early-warning system that rescue professionals wish every family had.

Like having a 24/7 safety inspector plugged into your wall — constantly monitoring your air so you don't have to.

What Makes Hosfu So Different

Isabella R.
Verified Purchase
"I’ve always hated feeling anxious about hidden gas leaks. This device is completely hands-off and simple. It fits perfectly into our modern kitchen setup. Just knowing it continuously monitors the air for both natural gas and CO gives our family total peace of mind. The added temperature and humidity display is a great bonus."

Hosfu™ 4in1 Gas Detector CO

Hosfu™ 4in1 Gas Detector CO

 4.8/5 (150+ Reviews) | 5,000+ Happy Users

Protect Your Family from Silent Threats 24/7

radar_wave Real-Time Display — Know What You Breathe

Digital screens show exact CO and gas levels instantly, giving you clarity instead of just a flashing light.

power_socket_connector_icon Plug & Play — Zero Installation Hassle

Simply plug it into any wall outlet near your kitchen or boiler. No drilling or hardwiring needed.

waves_icon 85dB Siren — Wakes Heavy Sleepers

Ultra-loud alarm instantly alerts your entire household at the first sign of dangerous gas leaks.

shield_icon CE Certified — Complete Peace of Mind

Reliably detects Carbon Monoxide, Natural Gas, and Propane, meeting strict European safety standards.

 
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Hosfu™ 4in1 Gas Detector CO

Hosfu™ 4in1 Gas Detector CO

$65.99
$65.99 $89.99
SAVE 26% Sold out

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  • assured_workload 30-Day Money-Back Guarantee
  • add_circle Recommended by Firefighters
  • shield 24/7 Home Protection

Gas & CO Detector is engineered with highly sensitive, multi-threat sensors. It continuously samples the air for invisible, odorless Carbon Monoxide (CO) and combustible gases like Natural Gas and Propane (LPG). Unlike traditional alarms that leave you guessing, our device features a smart microchip and a real-time digital display to track exact gas concentrations (PPM and %LEL). The moment dangerous thresholds are crossed, it instantly triggers a piercing 85dB siren, ensuring your family has the crucial time needed to evacuate.

We designed this for zero-stress installation—no drilling, no hardwiring, and no electrician required.

  • Step 1: Plug It In. Simply plug the device directly into any standard wall outlet.
  • Step 2: Auto-Calibration. Wait a few moments as the device performs an automatic self-test and calibrates to your room's air quality.
  • Step 3: 24/7 Protection. Leave it to monitor your home round-the-clock.
    Placement Tip: For optimal safety, place units near high-risk areas such as the kitchen, gas boiler, fireplace, and hallways outside bedrooms.

Absolute Peace of Mind: Users sleep better knowing a reliable, CE-certified "silent guard" is protecting their loved ones from invisible threats 24/7.

No More Guesswork: The dynamic digital screen removes the anxiety of wondering what a flashing green light means. You see the actual air safety numbers, room temperature, and humidity at a glance.

Rental Compliance Made Easy: Airbnb and property hosts consistently rely on our detector to effortlessly meet local safety regulations and protect their guests without dealing with complex, permanent installations.

Processing: 1-2 business days (with tracking number provided).

US Delivery: 10-14 business days.

International: 10-20 business days.

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Fast & Secure Shipping • 24/7 Home Protection • Real-Time Gas & CO Detection • Plug & Play Setup • No Wiring Required • CE-Certified Sensors • 30-Day Money-Back Guarantee

Fast & Secure Shipping • 24/7 Home Protection • Real-Time Gas & CO Detection • Plug & Play Setup • No Wiring Required • CE-Certified Sensors • 30-Day Money-Back Guarantee

Fast & Secure Shipping • 24/7 Home Protection • Real-Time Gas & CO Detection • Plug & Play Setup • No Wiring Required • CE-Certified Sensors • 30-Day Money-Back Guarantee

Fast & Secure Shipping • 24/7 Home Protection • Real-Time Gas & CO Detection • Plug & Play Setup • No Wiring Required • CE-Certified Sensors • 30-Day Money-Back Guarantee

Fast & Secure Shipping • 24/7 Home Protection • Real-Time Gas & CO Detection • Plug & Play Setup • No Wiring Required • CE-Certified Sensors • 30-Day Money-Back Guarantee

Fast & Secure Shipping • 24/7 Home Protection • Real-Time Gas & CO Detection • Plug & Play Setup • No Wiring Required • CE-Certified Sensors • 30-Day Money-Back Guarantee

Fast & Secure Shipping • 24/7 Home Protection • Real-Time Gas & CO Detection • Plug & Play Setup • No Wiring Required • CE-Certified Sensors • 30-Day Money-Back Guarantee

Fast & Secure Shipping • 24/7 Home Protection • Real-Time Gas & CO Detection • Plug & Play Setup • No Wiring Required • CE-Certified Sensors • 30-Day Money-Back Guarantee

Fast & Secure Shipping • 24/7 Home Protection • Real-Time Gas & CO Detection • Plug & Play Setup • No Wiring Required • CE-Certified Sensors • 30-Day Money-Back Guarantee

Fast & Secure Shipping • 24/7 Home Protection • Real-Time Gas & CO Detection • Plug & Play Setup • No Wiring Required • CE-Certified Sensors • 30-Day Money-Back Guarantee

Fast & Secure Shipping • 24/7 Home Protection • Real-Time Gas & CO Detection • Plug & Play Setup • No Wiring Required • CE-Certified Sensors • 30-Day Money-Back Guarantee

Fast & Secure Shipping • 24/7 Home Protection • Real-Time Gas & CO Detection • Plug & Play Setup • No Wiring Required • CE-Certified Sensors • 30-Day Money-Back Guarantee

Fast & Secure Shipping • 24/7 Home Protection • Real-Time Gas & CO Detection • Plug & Play Setup • No Wiring Required • CE-Certified Sensors • 30-Day Money-Back Guarantee

Fast & Secure Shipping • 24/7 Home Protection • Real-Time Gas & CO Detection • Plug & Play Setup • No Wiring Required • CE-Certified Sensors • 30-Day Money-Back Guarantee

Fast & Secure Shipping • 24/7 Home Protection • Real-Time Gas & CO Detection • Plug & Play Setup • No Wiring Required • CE-Certified Sensors • 30-Day Money-Back Guarantee

Fast & Secure Shipping • 24/7 Home Protection • Real-Time Gas & CO Detection • Plug & Play Setup • No Wiring Required • CE-Certified Sensors • 30-Day Money-Back Guarantee

Join 5,000+ Homeowners Who Secured Their Homes

    Why Homes & Hosts Trust Hosfu For Their Safety

    Designed for precision, effortless setup, and absolute peace of mind.

    radar_wave
    Real-Time Precision Display

    Stop guessing with basic indicator lights. The smart digital screen shows exact Carbon Monoxide (PPM) and combustible gas (%LEL) levels instantly, giving you complete clarity on the air you breathe.

    power_socket_connector_icon
    Instant Plug & Play Setup

    Complete protection in seconds. Simply plug the device into any standard wall socket near your boiler, fireplace, or kitchen. No drilling, no hardwiring, and no professional help needed.

    waves_icon
    85dB Unmissable Alarm

    Engineered to wake even the heaviest sleepers. A piercing 85dB siren triggers instantly at the first sign of danger, ensuring your family has the crucial time needed to evacuate safely.

    shield_icon
    Certified EU Protection

    Fully CE-certified and rigorously tested. A single device reliably monitors CO, Natural Gas, and Propane simultaneously, making it essential compliance for every modern home or Airbnb rental.

    Questions Customers Ask Before Buying

    Most traditional detectors only sound an alarm when gas concentrations reach dangerous levels (e.g., 70 ppm), meaning you have already been exposed for hours. Our device features a real-time digital display starting at 0 ppm, allowing you to see rising threats before they become an emergency.

    Yes. This product utilizes the same high-accuracy sensor technology trusted by emergency first responders and fire departments. It is rigorously tested and fully CE-certified to meet the strictest European safety standards (EN 50291 and EN 50194).

    It is a comprehensive 4-in-1 safety device. It continuously monitors your air for invisible, odorless Carbon Monoxide (CO), as well as combustible gases like Natural Gas and Propane (LPG). It also displays real-time room temperature and humidity.

    For optimal protection, we recommend plugging the unit into wall outlets near potential leak sources. Ideal locations include the kitchen (near gas stoves), next to gas boilers, near fireplaces, and in the hallways right outside sleeping areas.

    Not at all. The detector is designed for zero-stress "Plug & Play" installation. Simply plug it directly into any standard wall socket. No drilling, no messy wires, and no professional installation required.

    Absolutely. If gas levels exceed safe thresholds, the device instantly triggers a piercing 85-decibel siren. It is purposely engineered to be extremely loud to wake up heavy sleepers and alert everyone in the household immediately.

    Your family's safety and your peace of mind are our top priorities. We offer a hassle-free 30-day money-back guarantee. If you don't feel completely secure with your detector, simply return it for a full refund.