For installations of a tank heater of 500 gallons water capacity or less, what is the minimum required distance from external exposures?

The minimum required distance from external exposures for installations of a tank heater with a capacity of 500 gallons of water or less is 10 feet. This safety requirement is in place to reduce the risk of any potential fire hazards that may arise from exposure to ignition sources, particularly when it comes to propane and other combustible materials. Maintaining this distance helps to ensure that the heater operates safely and minimizes the risk of accidents due to external factors, such as flames, heat sources, or other risks that may be present nearby. This guideline is vital in promoting safety protocols in propane installations, ultimately protecting both people and property.