HEIMAN
Heiman Carbon Monoxide Detectors, Low-Level Digital Display CO Alarm 3 Pack
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Highlights
- 10 Year Sealed Lithium Battery, No Replacement Needed — Equipped with a built-in 10-Year CR-2/3AZ lithium battery, this carbon monoxide alarm uses a sealed, non-removable battery design. Initial activation requires inserting the included bracket into the back groove and pushing upward. Once started, this CO alarm cannot be manually turned off and operates until the end of its lifespan or when the low-battery alert appears.
- UL 2034 5th Edition Certified & CSFM Approved — Meets UL 2034 5th Edition requirements and is approved by the California State Fire Marshal (CSFM) for residential carbon monoxide alarm applications. Designed to follow NFPA installation guidelines, this alarm provides reliable, code-compliant protection for homes, rental properties and residential spaces.
- Real-Time LCD Display + Graded Low Level CO Early Warning System — This carbon monoxide detector features a clear digital screen showing live CO readings starting at 20ppm, so you can gauge hazard severity at a glance. The co alarm delivers multi-stage alert system: 30ppm early warning for slow low-level buildup, a loud 85dB danger alarm, and 12-hour alarm memory to alert you of missed CO events when you return home.
- Dual Installation Modes | Tabletop & Wall Mount — No wiring or electrician needed for this co detector. Place directly on any flat surface for instant use, or wall-mount with the included full hardware kit. It auto-powers on after a 100-second warm-up with zero extra setup.
- Ultra-Compact & Portable for Home & Travel — Measuring just 4.09" L × 2.89" H × 1.43" W, and only 4.37 oz, this lightweight CO detector works perfectly for everyday home use and on-the-go protection. Bring reliable CO safety to hotels, vacation rentals, RVs, cabins and more.
- One-Touch Hush & Simple Weekly Self-Test — The single Test/Hush button silences nuisance CO alarms (4 minutes), low-battery chirps (12 hours) and end-of-life alerts (48 hours), while uninterrupted CO monitoring remains active. Use the button for quick weekly self-tests to confirm proper operation.
- All-Source CO Detection for Home, RV & Travel — Reliably detects carbon monoxide from fuel-burning sources, including gas furnaces, water heaters, fireplaces, car exhaust, clothes dryers and kitchen stoves. Compact and portable for flexible use at home, in RVs, campers, and during travel. Ideal for bedrooms, hallways, living rooms, basements, garages and multiple floors of your home.
Why You'll Love It
- Sealed 10-year lithium battery eliminates the hassle of routine battery replacements
- Digital LCD screen shows live CO levels starting from 20ppm for early visibility
- Early warning triggers at 30ppm alongside a loud 85dB danger alarm
- Twelve-hour memory alerts you to any carbon monoxide events that occurred while away
- No-wiring setup allows wall mounting or standalone placement on tables and shelves
- Compact 4.37-ounce build makes it easy to take into RVs and vacation rentals
Pros
- +Sealed 10-year lithium battery
- +Real-time digital display from 20ppm
- +Loud 85dB alarm and early warning
- +Works tabletop or wall mounted
- +Compact and lightweight for travel
Cons
- -Battery cannot be replaced or removed
- -Cannot be manually turned off once started
- -Requires 100-second warm-up upon activation
Detailed Review
The HEIMAN Carbon Monoxide Detector 3 Pack provides continuous monitoring for fuel-burning appliances, including gas furnaces, water heaters, fireplaces, kitchen stoves, clothes dryers, and vehicle exhaust. It suits homeowners, renters, and travelers who need multi-room or portable carbon monoxide safety without running electrical wiring. Certified to UL 2034 5th Edition standards and CSFM approved, these units deliver code-compliant protection for residential spaces.
Each unit features a digital LCD screen that displays live readings starting at 20ppm. The system uses a multi-stage approach, giving an early warning at 30ppm for low-level buildups and sounding an 85dB alert for hazardous levels. A built-in 12-hour memory logs missed events so you know if levels rose while you were out. For nuisance alarms or end-of-life alerts, a single Test/Hush button silences the sound temporarily while keeping monitoring active.
Installation requires no electrician. After sliding the included bracket into the back groove, the detector powers on automatically after a 100-second warm-up. You can mount it to a wall using the included hardware kit or set it upright on any flat tabletop. At just 4.37 ounces and under 4.1 inches long, the alarms are portable enough to pack for cabins, hotels, campers, and RV trips.
A key consideration is the non-replaceable CR-2/3AZ lithium battery design. Once you activate the bracket, the unit cannot be manually shut down and will run continuously until it reaches the end of its 10-year lifespan or triggers a low-battery alert. If you prefer devices with standard removable batteries that you can switch out manually, this sealed format may not match your preference.
Verdict: This three-pack is a reliable, low-maintenance choice for covering bedrooms, basements, and living areas across multiple floors. It is an excellent match for anyone wanting clear digital readouts and a sealed 10-year battery without wiring hassles.
Specifications
- Dimensions: 4.09 inch L x 2.89 inch H x 1.43 inch W
- Weight: 4.37 oz
- Battery Type: Built-in 10-year CR-2/3AZ sealed lithium
- Alarm Volume: 85dB
- Display Range: Starts at 20ppm
- Certifications: UL 2034 5th Edition, CSFM Approved
- Package Quantity: 3 Pack
Who Should Buy It
A great fit if you:
- Need multi-room coverage for bedrooms, basements, garages, and hallways without hardwiring
- Want a clear digital readout to track low-level CO concentrations starting at 20ppm
- Travel frequently and want a lightweight monitor for RVs, vacation rentals, or hotels
- Prefer a sealed 10-year battery system that requires no routine battery swaps
Consider something else if you:
- Want a detector with replaceable or removable standard batteries
- Need an alarm that you can manually power off after activation
FAQ
How do I activate the detector for the first time?
Insert the included bracket into the back groove and push upward. The unit will automatically power on after a 100-second warm-up period.
Can I turn the alarm off after activating it?
No. Once started, the unit cannot be manually shut off and continues operating until the end of its lifespan or when a low-battery alert occurs.
What does the hush button do?
The single Test/Hush button silences nuisance CO alarms for 4 minutes, low-battery chirps for 12 hours, and end-of-life alerts for 48 hours while keeping CO monitoring active.
What safety certifications does this detector carry?
It meets UL 2034 5th Edition requirements, is approved by the California State Fire Marshal (CSFM), and is designed to follow NFPA installation guidelines.
Product Details
| Brand | HEIMAN |
| ASIN | B0GQGV3MMF |
