Weil McLain 386-700-355 Combustion Chamber Kit

When performing a rebuild or routine maintenance on oil-fired cast iron boilers, the Weil McLain 386-700-355 Combustion Chamber Kit is the required OEM solution for restoring thermal integrity. This comprehensive kit is engineered specifically for Weil McLain WTGO, WGO, and SGO series boilers, providing the thermal protection necessary to maintain efficient heat transfer and prevent heat loss through the jacket. As an OEM combustion chamber replacement, it ensures the target firing rate is met without risking damage to the target wall or surrounding sections.

This kit includes a high-density front and rear refractory, an insulation blanket, door seal rope, and water glass (Sodium Silicate) for proper adhesion and sealing. Replacing deteriorating refractory is critical for preventing burner vibration and ensuring the flame pattern remains centered within the boiler combustion chamber. Using this HVAC replacement part ensures a precise fit for residential and commercial heating systems, maintaining the specific acoustics and internal temperatures intended by the manufacturer.

Key Benefits for Technicians:

• Universal Series Compatibility: Fits all variations of WGO, WTGO, and SGO models, streamlining truck stock for boiler maintenance.
• Complete Sealing Kit: Includes boiler insulation blankets and door rope to prevent flue gas leaks and maximize seasonal efficiency.
• Refractory Durability: OEM-spec refractory material resists thermal shock and high-velocity oil flames.
• Simplified Installation: Factory-cut components reduce field modification time during emergency heating system repair.

Common Technical Questions:

Does this kit include the adhesive for the refractory?
Yes, the kit includes water glass, which is the industry-standard liquid adhesive used to secure the refractory panels during installation.

Is this compatible with the Gold Oil (Go) Series?
The Weil McLain 386-700-355 is the correct service part for the WGO and WTGO "Gold" series oil boilers.

When should a combustion chamber kit be replaced?
Technicians should replace the combustion chamber liner if the target wall is cracked, the floor is saturated with oil, or if the refractory is thinning, which leads to overheating of the boiler’s external jacket.

Safety Notice:
California Proposition 65 Warning: This product contains materials known to the State of California to cause cancer and/or reproductive harm.

This item is not eligible for free shipping.

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.