Gas leak detectors plug-in, hardwired, battery and handheld detectors for your brand

• Plug-in combustible gas alarms — plug straight into a wall outlet; some models add a cord so the detector can sit at the right height for the gas (high for methane, low for propane). The volume format for retail.
• Hardwired and wall-mount alarms — 120 V or low-voltage units, often with battery backup and an optional relay to close a gas shutoff valve; common in property and project supply.
• Battery and 12 V DC detectors — for places without a convenient outlet, and for RVs, vans and boats wired on 12 V.
• Handheld gas leak detectors — a flexible gooseneck probe with an audible ticking rate and LED bar to trace a leak along pipes, fittings and appliance connections; sold to tradespeople, DIY retail and property maintenance teams.
• Combination gas + CO detectors — one housing with a combustible gas sensor and a carbon monoxide sensor; see the CO section below.

Which one fits depends on the gas. Methane (natural gas) is lighter than air and collects high; propane (LPG) is heavier than air and collects low. That is why we keep two dedicated lines: natural gas detectors mounted high, and propane gas detectors mounted low.

Semiconductor (metal-oxide) sensors change resistance when combustible gas reaches a heated sensing layer. They respond to methane, propane and butane, are cost-effective and dominate household plug-in alarms; the heater means they normally run on mains or 12 V power. Catalytic bead (pellistor) sensors oxidize gas on a heated bead and measure the temperature change, reading in % of the lower explosive limit (%LEL); they are more common in handheld and professional instruments. Electrochemical sensors are the usual choice for carbon monoxide: low power, battery-friendly, with a finite sensor life that should drive an end-of-life signal. The specs & selection guide compares all three.

Carbon monoxide (CO) is a different hazard from a gas leak: it is a combustion by-product of furnaces, water heaters, stoves, generators and vehicles, and it has no smell. Buyers who sell gas leak detectors are usually asked for CO too, so we quote:

• Battery CO detectors with electrochemical sensors, optional digital ppm display and end-of-life signal;
• Plug-in CO detectors with battery backup;
• Combination natural gas + CO and propane + CO units — popular for homes with gas appliances and for RVs.

CO alarm thresholds, response times and sound levels are defined by the standard of your market. They are specified per SKU and confirmed with documentation per order — we do not publish them here. CO alarms are a regulated product in many jurisdictions; the listing your retailer requires is confirmed at the brief stage.

• Alarm: horn sound level specified per SKU, flashing LED, optional voice alarm (“Warning, gas detected”).
• Display: none, LED status, or digital readout (%LEL for combustible gas, ppm for CO).
• Controls: test / hush button, power-on self-test, fault and end-of-life signals.
• Outputs: relay or 12 V output to drive a shutoff valve or exhaust fan on hardwired models.
• Connectivity: Wi-Fi / Zigbee smart versions and interconnect on selected platforms — quoted per SKU.
• Housing: color, logo, label and plug type for the US (120 V) or other markets.

Security and smart-home brands adding a detector line; hardware and home-improvement brands; retailers and e-commerce sellers; RV, camping and marine channels; and property managers or project procurement teams equipping apartments, rentals and developments. Private label runs through OEM; stock SKUs and mixed orders through wholesale.