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Gas detectors and alarms: top picks

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Gas detectors and alarms: top picks

AI-generated summary · updated September 11, 2026 · verify details before purchase.

  1. First Alert CO400 Carbon Monoxide Detector
    Best budget pick First Alert

    First Alert CO400 Carbon Monoxide Detector

    4.5/5 $21.95

    Battery-powered CO alarm with electrochemical sensor; reliable and affordable for basic protection.

    • Affordable
    • Easy installation
    • Compact design
    • No digital display
    View on Amazon manufacturer site
  2. Kidde Nighthawk KN-COEG-3 Plug-in CO & Explosive Gas Alarm
    Best combo detector Kidde

    Kidde Nighthawk KN-COEG-3 Plug-in CO & Explosive Gas Alarm

    4.5/5 $57.47

    Detects both carbon monoxide and explosive gases like natural gas and propane; plug-in with battery backup.

    • Dual detection
    • Battery backup
    • Peak level memory
    • Bulky design
    View on Amazon manufacturer site
  3. First Alert CO710 Dual Power Carbon Monoxide Alarm
    Best overall value First Alert

    First Alert CO710 Dual Power Carbon Monoxide Alarm

    4.6/5 $44.00

    Plug-in CO alarm with battery backup, digital display, and silence button; top-rated reliability.

    • Digital display
    • Voice alert
    • Easy to use
    • None notable
    View on Amazon manufacturer site
  4. Kidde KN-COB-DP-H Nighthawk Plug-in Carbon Monoxide Alarm
    Best value CO detector Kidde

    Kidde KN-COB-DP-H Nighthawk Plug-in Carbon Monoxide Alarm

    4.4/5 $38.00

    Digital display, peak level memory, and 7-year warranty; reliable and well-priced.

    • Digital display
    • Long warranty
    • Accurate sensor
    • No gas detection
    View on Amazon manufacturer site
  5. EGAir Propane and Natural Gas Detector
    Best for gas leak detection TOPTES

    EGAir Propane and Natural Gas Detector

    4.4/5 $39.99

    Plug-in alarm for propane, natural gas, and methane; loud alarm and digital display.

    • Detects multiple gases
    • Visual display
    • LED indicator
    • No CO detection
    View on Amazon
  6. First Alert SC9120B Smoke & Carbon Monoxide Alarm
    Best dual smoke & CO First Alert

    First Alert SC9120B Smoke & Carbon Monoxide Alarm

    4.5/5 $151.44

    Combination smoke and CO alarm with tamper-proof battery and silence feature; essential for bedrooms.

    • Dual protection
    • Sealed battery lasts 10 years
    • Meets safety standards
    • Sealed battery can't be replaced
    View on Amazon manufacturer site
  7. Natural Gas Detector by GZAIR
    Best for RV/camper TOPTES

    Natural Gas Detector by GZAIR

    4.3/5 $39.99

    Portable gas detector for propane, methane, and LPG with AC/DC power; compact and travel-friendly.

    • Portable
    • Dual power
    • Alarm logs
    • No CO detection
    • Limited range
    View on Amazon
  8. Kidde P3010KCO Combination Smoke & CO Alarm
    Best premium combo Kidde

    Kidde P3010KCO Combination Smoke & CO Alarm

    4.6/5 $64.92 Currently unavailable

    10-year sealed battery dual sensor alarm with voice alerts; smart features available via wireless interconnect.

    • Voice alerts
    • 10-year battery
    • Wireless interconnect
    • Higher price
    View on Amazon manufacturer site

What to consider before buying

Consider whether you need a combined smoke/CO alarm, a standalone CO alarm, or a gas leak detector. For basic protection, a budget CO alarm suffices; for comprehensive safety, opt for a dual-sensor combo with digital display and voice alerts. Check battery type and lifespan - sealed 10-year lithium batteries reduce maintenance. Ensure compliance with local codes (e.g., UL listed).

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