Protect Your Family From the Silent Killer
Steadfast is an easy-to-use 4-in-1 CO & gas detector that shows you real-time danger levels - so you can protect your family before it’s too late.
See Danger at 10 PPM — Not 70 PPM like cheap detectors that wait until it’s too late
Plug & Protect — No ladder, no tools, no electrician. 5 seconds to install.
Works for Whole Family — Protects kids, parents, grandparents — everyone under your roof
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100-Day Money-Back Guarantee
Try Steadfast in your home for 100 days—if you’re not completely satisfied, simply return it for a full refund.
“Never thought about CO until a friend had a scare. Plugged this in, saw the zero on the screen and felt better instantly. I look at that ‘0’ every single day and exhale. It just sits there and does its job — watching the air so I don’t have to.”
Don’t Become Another Headline.
Carbon monoxide is the #1 cause of accidental poisoning deaths in Britain.
Every year, over 60 British families die from CO poisoning, most of them while sleeping. The tragedy? Almost every victim had a "working" detector on their wall. Green light glowing. Silent.
CO comes from boilers, gas hobs, gas fires, water heaters. You can't smell it. You can't see it.
You just don't wake up.
Every Breath Counts. Cheap detectors wait. Steadfast doesn't.
Introducing: The Steadsafe 4-in-1 Detector
Steadfast is a professional-grade detector specifically designed to show you real-time CO, natural gas, and propane levels starting at 10 PPM — plus smoke due to fire.
It’s an easy-to-use, accurate device that anyone can install in 5 seconds — no ladder, no tools, no electrician.
Keeping a Steadfast in your home is one of the most important decisions you can make for yourself and your family.
Because the silent killer doesn’t give warnings. Steadfast does.
Designed By Firefighters. Built To Save Lives.
Steadfast was developed with first responders who saw the same tragedy repeat itself — families with “working” detectors who never got the warning they deserved.
✓ Professional-Grade Electrochemical Sensors — Same technology used by fire departments
✓ Self-Testing 24/7 — Automatically checks itself for safety and accuracy
✓ Battery Backup — Keeps watching even when the power goes out
Steadfast isn’t just another detector. It’s the detector firefighters wish every home had.
Like having a fire station in your hallway — watching the air so you don’t have to.
Meet the British Families who protect themselves with Steadfast
Over 151,637+ Homes upgraded already
What Makes Steadfast So Different
Your Purchase Is Protected By Our
100-Day "Sleep In Peace" Guarantee
Here at Steadfast, we make sure our customers feel safer or we refund 100% of their investment. We’re so confident you’ll finally sleep knowing your family is protected that we’ll bear all the risk.
Questions from Homeowners
How is Steadfast different from my current detector?
How is Steadfast different from my current detector?
Most detectors only show a green light — which stays on even when the sensor is dead. They don't alarm until 70 PPM, which is AFTER hours of exposure. Steadfast shows you real-time levels from 10 PPM on a digital display. You see the truth, not a light that lies.
Will it false alarm when I cook?
Will it false alarm when I cook?
No. Steadfast uses professional-grade electrochemical sensors — the same type used in professional detection equipment. They detect real threats, not toast or shower steam.
Does Steadfast detect propane and natural gas, or just carbon monoxide?
Does Steadfast detect propane and natural gas, or just carbon monoxide?
Steadfast is a 4-in-1 detector. It monitors carbon monoxide, natural gas, AND propane, plus smoke due to fire. This is a critical distinction. Most cheap detectors from the hardware store only detect CO. If your stove leaks natural gas, your furnace has a propane leak, or your water heater line is compromised, those detectors stay completely silent. Steadfast catches all three gas threats in real-time, with PPM readings on the display starting at 0. One unit. Complete protection. No gaps.
Where should I install it? Does height or outlet position matter?
Where should I install it? Does height or outlet position matter?
Steadfast plugs into any standard wall outlet — no ladder, no tools, no electrician. 5 seconds and you're protected. For placement, focus on two priorities: near gas appliances (furnaces, stoves, water heaters) and in hallways outside bedrooms where your family sleeps. Most families start with one near the furnace/water heater, one in the kitchen near the stove, and one in the hallway outside bedrooms. The 4-Pack covers most homes completely.
Is it hard to install?
Is it hard to install?
No. Plug it into any standard outlet. That's it. Takes 5 seconds. No ladder, no tools, no electrician.
How many do I need?
How many do I need?
One per floor + near bedrooms + near gas appliances (furnace, water heater, garage). Most homes need 4. Apartments typically need 2.
Can I use it if I live alone?
Can I use it if I live alone?
Yes! Steadfast is perfect for people who live alone. It watches 24/7 and will alert you to danger even while you're sleeping. Many of our customers are seniors who live independently and wanted peace of mind.
What if it doesn't work for me?
What if it doesn't work for me?
You're covered by our 100-Day "Sleep In Peace" Guarantee. If you're not satisfied for any reason, we'll refund every penny. No questions asked.
My detector is hardwired. Isn't that better?
My detector is hardwired. Isn't that better?
Hardwired means it runs on electricity — but the SENSOR inside still expires after 5–7 years. The green light stays on even when the sensor is dead. Steadfast plugs in, continuously self-tests, and shows you a real number, so you always know it's working.
How fast will I receive it?
How fast will I receive it?
Most orders ship within 1-3 business day from our US warehouse and arrive within 7–12 business days. You'll receive a tracking number by email as soon as your order ships.