Look for a combustible gas detector. These devices are designed to sense common household gases like natural gas (methane), propane, LPG, and butane. You’ll find a few helpful formats:

• Plug-in monitors: Continuous monitoring with audible (often 85 dB) and visual alerts, sometimes with LCD readouts.
• Handheld sniffers: Portable tools that help trace the exact source of a leak around valves, joints, and appliances.
• RV/12V detectors: Purpose-built for campers and trailers.
• Combo models: Some combine explosive gas and carbon monoxide alerts in one unit.

Note: Carbon monoxide and radon require different detectors. Always check each product’s listing to confirm which gases it’s designed to detect and follow the manufacturer’s guidelines.

You can use a few practical steps to investigate, while staying cautious:

• Use a detector: Install a plug-in gas monitor near potential sources, or scan fittings with a handheld sniffer.
• Smell and listen: A sulfur or “rotten egg” odor and hissing sounds can indicate a leak, but don’t rely on smell alone.
• Soapy water test: Apply soapy water to accessible threaded connections; bubbling may indicate a leak.
• Stay safe: Avoid flames, don’t operate electrical switches, and ventilate if it’s safe.

If the odor is strong or you’re concerned, leave immediately and contact your gas utility or emergency services from outside. Professional inspection can provide additional peace of mind.

Modern home gas detectors can provide dependable alerts when used correctly, though performance can vary by model and conditions. Many units offer:

• Clear alerts: Loud alarms and visual indicators, sometimes with LCDs or %LEL displays.
• Continuous or targeted monitoring: Plug-in units monitor spaces; handheld sniffers help pinpoint sources.
• Defined lifespans: Some sensors specify multi-year lifetimes; replace as recommended.

Accuracy depends on proper placement, regular testing, and keeping vents clear of dust and grease. Detectors are a helpful layer of protection, but they don’t replace professional maintenance or inspections. For best results, follow the manufacturer’s instructions and consider periodic checks by a qualified technician if you suspect issues.

Exposure to natural gas or propane may lead to symptoms such as headache, dizziness, nausea, fatigue, or confusion, especially in enclosed spaces. You might also notice a sulfur or “rotten egg” odor and, in some cases, hear hissing near lines or appliances. Because symptoms can overlap with other issues—including carbon monoxide exposure—it’s important to:

• Get fresh air immediately if you suspect a leak.
• Leave the area and contact your gas utility or emergency services.
• Seek medical advice if symptoms persist or worsen.

A combustible gas detector and a separate carbon monoxide alarm can help provide timely alerts, but they aren’t substitutes for medical care or professional inspection.

They serve different roles and can complement each other:

• Plug-in detectors: Provide continuous monitoring in a fixed spot (kitchen, utility room, RV). They typically feature loud alarms, indicator lights, and sometimes LCD screens. Setup is simple—just plug in and follow placement guidance.
• Handheld sniffers: Portable tools used to sweep along pipes, fittings, and appliances to help pinpoint a leak. Many include flexible probes and audible/visual alerts.

Plug-in models are great for 24/7 coverage, while handheld units help track down sources during checks or after an alert. Choose based on your space and needs, and follow each product’s instructions for best results.