Propane is dangerous. But it’s a great source for cooking, and like lots of other boaters, we use propane for our oven and cooktop. Propane marine installations are done carefully to prevent leaks. Since propane is heavier than air, it can settle below deck and in the bilge where it can be detonated by an engine start-up or electrical spark of any kind. So, it is important to monitor the equipment and to know about any leaks as soon as possible.