Propane/butane has become the fuel of choice for marine cooking and heating. Highly BTU-efficient and readily available, propane and butane fuels are becoming more and more a part of power boating and sailing. These gases are heavier-than-air and thus can settle below deck and in the bilge where they can be detonated by an engine start-up or electrical spark of any kind. Xintex detectors offer protection against the potential hazards of propane and butane accumulations.