The MTI Industries Propane Leak Detector That Goes Off Before I Smell Anything

Last spring, I woke up at 2 a.m. to a faint hissing sound near my kitchen slide. My old propane detector — the one that came stock with my rig — didn’t make a peep. I grabbed a flashlight, found a loose fitting on the stove connection, and tightened it up. But I couldn’t stop thinking: how long had that been leaking? Hours? All night? That moment pushed me hard into researching every RV propane leak detector review I could find. I was not going to leave my safety up to a detector I couldn’t trust.

Propane is heavier than air. It sinks to the floor and collects quietly. By the time you smell that rotten-egg odor, the concentration may already be dangerous. That fact alone made me realize I needed something far more sensitive than what I had. I started asking around in forums, watching YouTube teardowns, and comparing specs late into several evenings.

The Dual-Sensor Detector That Won’t Let You Sleep Through a Slow Leak

Stock RV propane detectors are notoriously slow to trigger — sometimes they won’t alarm at all until you’ve got a hazardous concentration in your living space. The Safe T Alert Dual LP/CO picks up propane leaks faster and at lower concentrations than the OEM unit that came with your rig, which means you catch a loose fitting or a slow supply-line failure before it becomes a 2 a.m. nightmare.

What works

• Alarms at 1/4 LEL (lower explosive limit), catching small leaks that won’t register on cheaper detectors — you’ll hear it hiss before it becomes invisible danger.
• Dual sensor means it’s also monitoring CO from your furnace or water heater, so you’re not running a separate single-purpose unit.
• Flush mount sits flush against the ceiling or wall, doesn’t protrude like a plastic box and look like an afterthought.

What doesn’t

• Requires 12V DC hardwiring — no battery backup, so if your coach battery is dead, the detector is offline (install a dedicated fused line from your main panel).
• Higher sensitivity means occasional false alarms if you’re cooking heavily or if propane appliance ignition is slow — expect a few midnight screams while you adjust.

I second-guessed buying the 35-742-BL because the higher alarm threshold scared me — wouldn’t it go off too often? — but once I stopped burning stuff on the stove like I was running a diner, it proved itself by catching a weeping regulator fitting I would have missed for weeks. Get the Safe-T-Alert by MTI Industries 35-742-BR 35 Series Dual.

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