We publish independently verified buyer reviews, trust score data, and real-world performance comparisons for CO and gas detectors — so your family's safety decisions are based on facts, not marketing.
11/100 Gridinsoft · 3 blacklist flags · Domain 33 days old at review · No verifiable certification found
"Ordered in February, nothing arrived by April. Support emails unanswered. No tracking update beyond label created."
UL 2034 or ETL certification · Real-time PPM display from 0 PPM · Verifiable support channel · Traceable reviews
Source data from the US Centers for Disease Control (CDC), CPSC, and independent trust score databases.
Source: Gridinsoft, Scam Detector, Scamadviser. Scores as of April 2026.
| Detector | Alarm Threshold | Real-time Display |
|---|---|---|
| GuardAir Pro | From 0 PPM | ✓ Continuous |
| Kidde KN-COEG-3 | 70 PPM | Peak only |
| First Alert CO615 | 70 PPM | Alarm only |
| Steadfast "Haven" | Unverified | Unverified |
Carbon monoxide is odourless and colourless. Understanding how detectors work is the first step to genuine protection.
UL 2034 is the US safety standard for CO detectors. It requires devices to alarm when CO reaches 70 PPM sustained over 60–240 minutes. Look for this mark on the physical packaging — not just the website.
The UL 2034 standard sets a threshold of 70 PPM — but OSHA's workplace limit is just 35 PPM. Children, the elderly, and those with heart or respiratory conditions can be affected at concentrations well below 70 PPM.
Unverified detectors may fail to trigger at dangerous concentrations, use inaccurate sensors, or degrade quickly. UL and ETL certification involves independent third-party laboratory testing — check the databases yourself at ul.com and intertek.com.
Gas boilers and furnaces, wood-burning stoves, attached garages, portable generators, and gas cooking appliances are the most common residential CO sources. Detectors should be installed on every level of the home.
Install on every level, including the basement. Place near sleeping areas so alarms wake occupants. Keep at least 15 feet from fuel-burning appliances to avoid nuisance alarms. Test monthly, replace every 5–7 years.
Electrochemical sensors offer greater accuracy and longer life than cheaper semiconductor (metal oxide) sensors. Quality certified detectors use electrochemical cells — a key differentiator often absent from unverified discount products.
Scores sourced from Gridinsoft, Scam Detector, and Scamadviser. Updated April 2026. Lower scores indicate more risk factors.
Submitted by verified buyers. Reviewed before publishing.
"Ordered in February. It is now April. Nothing delivered. Support emails go unanswered."
"Received device. No certification marks on packaging. Return request denied. Display shows constant '000'."
"Arrived in 4 days. UL certification verified on ul.com. Real-time display works exactly as described."
"Reliable certified brand. Alarms correctly when tested. Display is blank until alarm — something to be aware of."
Every review goes through the same process before it's published. Here's how we maintain accuracy.
Buyers submit their experience — product, delivery outcome, whether it worked, and a star rating. Email optional for verification.
Our team checks submissions against trust score databases, cross-references product names, and screens for coordinated or synthetic patterns.
Verified reviews are published within 24 hours. We do not edit review content — only validate the submission is genuine.
Look for a UL 2034 or ETL certification mark on the physical product packaging — verify this independently at ul.com or intertek.com. Avoid relying solely on website claims. Additionally, consider whether the device offers real-time PPM display (not just an alarm at 70 PPM), the type of sensor used (electrochemical is more accurate than semiconductor), and whether the manufacturer has a verifiable, working support channel.
Trust scoring services like Gridinsoft and Scam Detector analyse domain age, blacklist status, WHOIS data, SSL certificates, hosting infrastructure, and patterns consistent with fraudulent activity. A score of 11/100 (as with truststeadfast.com) indicates multiple significant risk factors were found. While no system is infallible, very low scores combined with community reports warrant careful research before purchasing.
Haven is marketed as a 4-in-1 CO and gas detector sold through truststeadfast.com. Community reviews indicate delivery problems, absence of recognisable certification marks on physical packaging, and product performance that does not match advertised claims. We could not independently verify UL or ETL certification for the Haven device at time of publishing. We recommend verifying certification before any purchase of a life-safety device.
Contact the seller in writing and allow a reasonable response period. If unresolved, contact your payment provider (credit card company or PayPal) to understand your dispute options. We also invite you to submit your experience on this site so other buyers can make more informed decisions.
All reviews are submitted by community members and manually reviewed before publishing. We check for spam patterns and verify product/site names but do not edit review content. Our process is detailed on the About page.