WUVYFWN F273401 Pilot Assembly — Direct Replacement for Mr Heater MH9B/MH9BX, MH18B & DeWalt 78422

Exact-fit replacement for popular propane heaters

When a pilot assembly falters, a portable heater can lose reliability. The WUVYFWN F273401 pilot assembly is engineered as a direct OEM replacement for the most common small heaters, including Mr Heater MH9B, MH9BX, MH18B, and the DeWalt 78422 units. Designed for propane systems, this component focuses on a precise fit and durable construction to support long hours of quiet operation.

Propane-only design and model compatibility

This pilot assembly is intended for propane fired heaters and should not be used with other fuels. It aligns with MH9B, MH9BX, MH18B as well as DeWalt 78422 models, providing a straightforward swap that preserves original safety and performance expectations.

• Exact-fit replacement for MH9B and MH9BX models to restore reliable ignition
• Compatibility with MH18B and DeWalt 78422 space heaters to extend service life
• Propane-only design ensures correct fuel delivery and flame behavior

Addressing common ignition and heating issues

If your heater struggles to stay lit or the flame intermittently goes out, this pilot assembly offers a practical option to restore consistent ignition. It can also help mitigate symptoms such as a weak flame or uneven warmth, contributing to more stable operation.

• Helps prevent flame cut out and thermocouple related issues
• Supports more consistent heating performance during cold or windy conditions
• Provides a reliable pathway for fuel and ignition control within the burner assembly

Quality you can count on

Manufactured with durable materials designed to resist rust and deformation, the part is built for long service life and repeated use in portable heating environments. This emphasis on resilience helps maintain dependable operation across seasons.

Easy, safe installation

Installing the pilot assembly is a straightforward, tool-free process that mirrors a simple plug-and-play replacement. Safety note: always shut off the gas supply before beginning any replacement work and follow standard safety precautions.

What you gain

• Direct OEM alignment with your heater models for confident fit
• Preserved compatibility with the ODS and MH18B class of space heaters
• Enhanced durability from premium materials and precise manufacturing