Which is a common sign of a propane leak?

The odor of rotten eggs is a common sign of a propane leak due to the fact that propane itself is odorless. To ensure safety, an odorant called ethyl mercaptan is added to propane so that leaks can be easily detected by smell. This distinctive smell is often described as similar to rotten eggs or sulfur. Recognizing this odor is critical for safety, as it prompts immediate action to investigate and address the potential leak, thereby preventing possible hazards such as explosions or fires.

Other signs, such as increased pressure, frost on the tank, or unusual noises from the tank, can be related to different issues, but they are not as reliable or immediate indicators of a propane leak. Increased pressure might indicate a malfunctioning system or excessive heating, whereas frost could suggest low temperature in the tank due to high vaporization rates; both situations can occur without a leak. Noise from the tank might indicate several operational issues, but does not specifically signify the presence of a leak like the odor does. Therefore, the smell of rotten eggs is the most direct sign of a propane leak.