What is the minimum clearance required for a direct vent water heater from combustible materials?

The minimum clearance required for a direct vent water heater from combustible materials is 12 inches. This requirement ensures that there is adequate space for heat dissipation, reducing the risk of fire hazards and ensuring safe operation. Adequate clearance is critical not only for maintaining the integrity of combustible materials but also for allowing proper ventilation which is essential for the efficient operation of direct vent systems. The 12-inch clearance guideline is standard in many plumbing codes and practices, reflecting an understanding of both safety and performance in plumbing installations. This measurement helps to prevent any overheating of adjacent materials, which could potentially lead to combustion.