Protect Your Family From The Silent Killer

Protect Your Family
From The Silent Killer

Sentinel is an easy-to-use CO & gas detector that displays your real-time CO levels — so you can actually see your family is safe, not just hope.

  • See Danger at 0 PPM — Not 70 PPM like cheap detectors that wait until it's too late

  • Plug & Protect — No ladder, no tools, no electrician. 30 seconds to install.

  • Works for Whole Family — Protects kids, parents, grandparents — everyone under your roof

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"I was scrolling at 2 AM while nursing when I saw a video about a family who lost their toddler to CO poisoning. I threw up from anxiety. The next day I found Sentinel. The first night I installed it, I slept through until morning for the first time since my son was born. I look at that '0' every single day and exhale. I finally feel like the mom I'm supposed to be."

⭐⭐⭐⭐⭐ — Sonia B. 42 Liverpool

"I was scrolling at 2 AM while nursing when I saw a video about a family who lost their toddler to CO poisoning. I threw up from anxiety. The next day I found Sentinel. The first night I installed it, I slept through until morning for the first time since my son was born. I look at that '0' every single day and exhale. I finally feel like the mom I'm supposed to be."

⭐⭐⭐⭐⭐ — Sonia B. 42 Liverpool

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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. Sentinel doesn't.

Every Breath Counts.
Cheap detectors wait.
Sentinel doesn't.

Introducing: The Sentinel CO

& Gas Detector

Sentinel is a professional-grade detector specifically designed to show you real-time CO and natural gas levels starting at 0 PPM.

 

It's an easy-to-use, accurate device that anyone can install in 30 seconds — no ladder, no tools, no electrician.

 

Keeping a Sentinel 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. Sentinel does.

Designed By Firefighters. Built To Save Lives.

Sentinel was developed with Gas Safe engineers and firefighters who saw the same tragedy repeat itself — families with "working" detectors who never got the warning they deserved.

 

✓ Professional-Grade Electrochemical Sensor — same technology used by Gas Safe engineers on callouts

✓ Real-Time PPM Display — see exactly what's in your air, every second

✓ 4-in-1 Detection — CO, natural gas, temperature and humidity in one unit

 

Sentinel isn't just another detector. It's the detector Gas Safe engineers wish every British home had.

 

Like having a professional on your wall, watching the air so you don't have to.

Meet the British Familys who protect themselfes with Sentinel

Meet the British Familys
who protect themselfes
with Sentinel

Over 100.000+ Homes upgraded already

"I Saw 47 PPM. My Old Detector? Silent."

"We had a 'working' detector for 6 years. Green light. Beeped when I tested it. Then I got Sentinel just to double-check. First night: 47 PPM in my son's bedroom. My old detector? Still glowing green. Still silent. I unplugged it and threw it in the bin. Sentinel probably saved my son's life."

- Bobby G.

Verified Customer

"I Saw 47 PPM. My Old Detector? Silent."

"We had a 'working' detector for 6 years. Green light. Beeped when I tested it. Then I got Sentinel just to double-check. First night: 47 PPM in my son's bedroom. My old detector? Still glowing green. Still silent. I unplugged it and threw it in the bin. Sentinel probably saved my son's life."

- Bobby G.

Verified Customer

"Nan's House Is Safe Again!"

"When my daughter drops the grandkids off for the weekend, I can honestly say to myself, 'They are completely safe here.' I'm the nan, it's my job to keep this house safe. Sentinel gave me back that peace of mind. Nan's house is officially the safest place on earth again."

- Jan M.

Verified Customer

"I Sent One to My Mum"

"I bought one for our house and posted two to my parents. Mum is 74 and lives alone. Her old detector was 12 years old — the sensor was dead but the green light was still on. Now I don't lie awake at 2 AM wondering if she's okay. Best decision I ever made."

- Karolina S.

Verified Customer

What Makes Sentinel So Different

Protect Your Family. Get Your Sentinel Today!

CHOOSE FOR YOUR HOME:

FLATS & APARTMENTS

- 2 PACK

2-Pack Sentinel Detector© - TrustSentinel

£49.50

Per Detector

Total:

£198.00
£99.00

LIFETIME

GUARANTEE

FULL HOME COVERAGE
- 4 PACK

4-Pack Sentinel Detector© - TrustSentinel

£39.50

Per Detector

£318.00
£159.00

Total:

LIFETIME

GUARANTEE

FREE SHIPPING

FREE EBOOK

LIFETIME

GUARANTEE

FREE SHIPPING

FREE EBOOK

YOUR HOME + PARENTS' HOME
- 8 PACK

8-Pack Sentinel Detector© - TrustSentinel

£33.50

Per Detector

£538.00
£269.00

Total:

LIFETIME

GUARANTEE

FREE SHIPPING

FREE EBOOK

LIFETIME

GUARANTEE

FREE SHIPPING

FREE EBOOK

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We use a 256-bit secure shopping cart where 100% of your data is encrypted, safe and secure. This is the same data security standard used by most banks, governments and military organizations.

Your Purchase Is Protected By Our

90-Day "Sleep In Peace" Guarantee

Here at Sentinel, 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.

90 Day Money

Back Guarantee

Some families feel the relief the first night. Some take a week to stop checking the old detector out of habit. Everyone's different. So the best thing you can do is give it a try — and if you don't feel safer, calmer, and finally certain your family is protected, you have 90 days to claim a refund and get your money back.

Here at Sentinel, 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.

Real, Verified Results:
See Why Families Are
Replacing Their Detectors
and Calling Sentinel "Life Saving"

Real, Verified Results:
 See Why Families Are Replacing Their Detectors and Calling Sentinel "Life Saving"

Note: All reviews below are from actual paying customers.

They have been authenticated and verified

"I Bought 5 — One for Each Family Member" 

1 day ago

"I kept one for myself and gave one to each of my adult children for their homes. I can't think of a better gift to give my family — a gift that says 'I love you and I want you safe' without saying 'I'm worried about you.' I hope they never need it, but if they do, Sentinel will be there."

Colonel Grayson M.        ✅ Verified Customer

"My Husband Doesn't Argue About Safety Anymore"

1 day ago

"My husband said our old detectors were 'fine.' Then I showed him that standard UK detectors don't have to alarm below 50 PPM. We ordered Sentinel that night. He doesn't argue about safety anymore."

Harper B.          ✅ Verified Customer

"One of the Most Important Things I Own"

12 days ago

"I'm going to be 80 years old and I've often thought, 'what would I do if something happened because I live alone?' Now I look at that little screen, see '0,' and I know. I'm not alone. Sentinel is watching."

Parker T.           ✅ Verified Customer

"I'm 74 and I Did It Myself"

16 days ago

"I am 74 years old and I secured my entire home in under an hour without climbing a dangerous ladder. I just plugged it into the wall socket. I felt so capable and independent. I don't have to ring my son to come check things for me — I have Sentinel telling me I'm perfectly fine."

Madison S.        ✅ Verified Customer

"It Caught What Our £200 Nest Missed"

21 days ago

"We had a Nest Protect in every room. Top of the line, right? I bought Sentinel just to compare. First week: Sentinel showed 29 PPM. The Nest? Silent. Green light. We had a cracked flue on the boiler. Four kids in this house. I don't even want to think about what could have happened."

Jon R.                ✅ Verified Customer

1 day ago

"I Bought 5 — One for Each Family Member" 

1 day ago

"I kept one for myself and gave one to each of my adult children for their homes. I can't think of a better gift to give my family — a gift that says 'I love you and I want you safe' without saying 'I'm worried about you.' I hope they never need it, but if they do, Sentinel will be there."

Colonel Grayson M.        ✅ Verified Customer

1 day ago

"My Husband Doesn't Argue About Safety Anymore"

1 day ago

"My husband said our old detectors were 'fine.' Then I showed him that standard UK detectors don't have to alarm below 50 PPM. We ordered Sentinel that night. He doesn't argue about safety anymore."

Harper B.          ✅ Verified Customer

12 days ago

"One of the Most Important Things I Own"

1 day ago

"I'm going to be 80 years old and I've often thought, 'what would I do if something happened because I live alone?' Now I look at that little screen, see '0,' and I know. I'm not alone. Sentinel is watching."

Parker T.           ✅ Verified Customer

16 days ago

"I'm 74 and I Did It Myself"

1 day ago

"I am 74 years old and I secured my entire home in under an hour without climbing a dangerous ladder. I just plugged it into the wall socket. I felt so capable and independent. I don't have to ring my son to come check things for me — I have Sentinel telling me I'm perfectly fine."

Madison S.        ✅ Verified Customer

21 days ago

"It Caught What Our £200 Nest Missed"

1 day ago

"We had a Nest Protect in every room. Top of the line, right? I bought Sentinel just to compare. First week: Sentinel showed 29 PPM. The Nest? Silent. Green light. We had a cracked flue on the boiler. Four kids in this house. I don't even want to think about what could have happened."

Jon R.                ✅ Verified Customer

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Questions from Homeowners

How is Sentinel 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 50 PPM, which can be AFTER 60-90 minutes of exposure. Sentinel shows you real-time levels from 0 PPM on a digital display. You see the truth, not a light that lies.

Will it false alarm when I cook?

No. Sentinel uses professional-grade electrochemical sensors — the same type used by Gas Safe engineers on callouts. They detect real threats, not toast or steam from the kettle.

Does Sentinel detect natural gas or just carbon monoxide?

Sentinel is a 4-in-1 detector. It monitors carbon monoxide, natural gas, temperature, and humidity. This is a critical distinction. Most cheap detectors from B&Q or Screwfix only detect CO. If your gas hob leaks, your boiler has a fault, or your water heater line is compromised, those detectors stay completely silent. Sentinel catches all threats in real-time, with PPM readings on the display starting at 0. One unit. Complete protection. No gaps.

Where should I install Sentinel?

Sentinel plugs into any standard UK wall socket (even if your socket are at ground level) no ladder, no tools, no electrician. 30 seconds and you're protected. For placement, focus on two priorities: near gas appliances (boiler, gas hob, water heater) and in hallways outside bedrooms where your family sleeps. Most families start with one near the boiler, one in the kitchen near the hob, and one in the hallway outside bedrooms. The 4-Pack covers most homes completely.

Is it hard to install?

No. Plug it into any eye-level UK socket. That's it. Takes 30 seconds. No ladder, no tools, no electrician.

How many do I need?

One per floor + near bedrooms + near gas appliances (boiler, water heater). Most homes need 4. Flats typically need 2.

Can I use it if I live alone?

Yes. Sentinel 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 without relying on family to check on them.

What if it doesn't work for me?

You're covered by our 30-Day Money Back Guarantee. If you're not satisfied for any reason, we'll refund every penny. No questions asked. Plus, the Lifetime Guarantee means we replace it free if anything ever goes wrong.

My detector is hardwired. Isn't that better?

Hardwired means it runs on mains electricity — but the sensor inside still expires after 5-7 years. The green light stays on even when the sensor is dead. Sentinel plugs in and shows you a real number, so you always know it's working.

How fast will I receive it?

We ship from our EU warehouse. 7-10 business days typically. Free delivery on all multipacks.

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