What is the minimum clearance required for an unlisted pool heater on all sides and the rear?

The minimum clearance required for an unlisted pool heater is 12 inches on all sides and the rear. This clearance requirement is crucial for safety and functionality. It allows for proper air circulation around the heater, which helps in effective combustion and prevents overheating. Additionally, this space is important for maintenance and service access. Having adequate clearance reduces the risk of fire hazards by ensuring that combustible materials are kept at a safe distance from the heat source.

In the context of unlisted pool heaters, which may not have undergone the rigorous testing and certification that listed appliances have, maintaining this minimum clearance is especially critical to mitigate potential hazards. Recognizing the specific requirements for different types of equipment helps ensure compliance with safety standards and regulations.