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The minimum distance from a property line that a pool heater can be installed is typically established to ensure safety and compliance with local building codes, which can vary by region but generally adhere to common standards. An 18-inch distance strikes a balance between the safety of the heater's operation and the need to maintain usable space around property lines.

This distance helps to prevent potential hazards, such as gas leaks or overheating, impacting neighboring properties. It allows for adequate air circulation and access for maintenance without infringing on adjacent property rights. The 18 inches is often specified to ensure enough clearance for both safety personnel and gas utility operations while conforming to minimum safety standards.

Other distances could potentially endanger safety protocols or violate building regulations, hence they are not deemed appropriate in most situations. The 18-inch requirement reflects a well-established standard that aligns with industry practices, ensuring that property owners can safely enjoy their pool installations with reduced risk of fire or gas-related incidents.