The Rinnai Kit Burner Box Plate Gasket 431F, part number 204000018, is a replacement gasket set designed to provide a heat-resistant seal between the burner box plate and adjacent surfaces on specified Rinnai gas heaters. It helps prevent combustion gases from leaking out of the burner enclosure and ensures that heat and pressure are properly contained within the combustion chamber. This kit is engineered to match the original equipment specifications so it fits precisely and seals effectively when installed in place of a worn or degraded gasket.
This gasket kit is intended for use during service or repair when the original burner box plate gasket shows signs of compression, cracking, brittleness, or loss of sealing integrity. A secure, heat-rated gasket supports proper combustion performance and contributes to safe operation by maintaining the combustion chamber environment. Installation should follow the model-specific service documentation so the gasket surface is clean, aligned, and secured per manufacturer guidelines.
What’s Included: Burner box plate gasket(s) for the specified Rinnai heater model.
Installation Limits: For replacement use only on compatible Rinnai gas heaters; install with the heater powered off and ensure all mating surfaces are clean and free of debris to achieve a proper seal.
Compatibility: Compatible with Rinnai gas heaters requiring the 431F burner box plate gasket as specified in the parts list or service manual.
