Lochinvar & A.O. Smith 100287085 Door

For veteran contractors maintaining high-efficiency hydronic systems, the Lochinvar & A.O. Smith 100287085 Burner Plate Insulation Door is a critical OEM replacement part designed for precise thermal management. This 304mm diameter burner door insulation (replaces legacy part 100145383) is engineered to withstand extreme combustion chamber temperatures while preventing energy-robbing heat loss. Specifically compatible with the Lochinvar Knight WHB399N, WHL400, WHN399, and WHN400 fire tube wall-mount boilers, this assembly ensures the burner plate remains protected from thermal stress, which is vital for preventing jacket overheating and maintaining 85% thermal efficiency or higher. Fabricated with high-grade ceramic fiberboard insulation, it provides a robust barrier that stabilizes internal operating temperatures. Installing a genuine Lochinvar 100287085 replacement is the standard professional practice for resolving "Blocked Flue" or "Air Pressure Switch" errors caused by compromised combustion seals or degraded insulation panels within the heat exchanger assembly.

• Optimized Thermal Retention: High-density insulation limits heat transfer to the exterior jacket, maximizing fuel-to-heat conversion.
• Direct OEM Compatibility: Verified fit for Lochinvar Knight and A.O. Smith commercial boilers, ensuring no gap-related pressure drops.
• System Longevity: Protects the burner plate and surrounding electronic components from premature heat-induced fatigue.
• Safety Compliance: Minimizes fire hazards by containing high-temperature combustion within the designated chamber.

• Does this part include the mounting gaskets? This is the burner plate insulation door assembly; technicians should always inspect the 100110895 gasket and replace it simultaneously to ensure a gas-tight seal.
• Will this fix an Air Pressure Switch (APS) error? If the error is caused by a compromised burner door seal or insulation breakdown leaking heat into the cabinet, replacing this part is the correct technical solution.
• Can I use this on 400k BTU models? Yes, this 304mm K-Series insulation is specifically sized for 399,000 and 400,000 BTU Lochinvar fire tube units.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.