Weil McLain 383-500-620 - 383-500-620 Maintenance Kit for Ultra Gas Boilers, Sizes 80/105

Optimizing combustion and ignition reliability is essential for the long-term performance of your hydronic system, which is why the Weil-McLain 383500620 maintenance kit is engineered for annual service on Ultra 80 and 105 MBH gas boilers. By replacing aging ignition and sensing components with this factory-authorized assembly, you ensure that your equipment continues to meet original safety and fuel efficiency benchmarks while preventing common burner failures.

This kit supports the precise alignment of the igniter and flame rectification probe, ensuring a stable flame signal throughout the boiler’s modulation cycle. Consistent probe positioning prevents flame-out errors and erratic cycling, which protects the heat exchanger from thermal stress and potential ignition-related complications during cold weather operation.

Key System Performance Baselines:

• Ignition Reliability: Maintains rapid spark-to-flame response times for consistent boiler startup.
• Combustion Accuracy: Ensures stable flame rectification to optimize fuel-to-air modulation.
• Preventative Maintenance: Reduces seasonal downtime by addressing wear components before system failure.

⚠️ Application Profile: Designed exclusively for annual maintenance cycles on Weil-McLain Ultra Series gas-fired boilers with 80 and 105 MBH firing rates.

📋 Procurement & Shipping Notice

• LTL Freight Dispatch: Heavy commercial units ship directly via insured LTL carrier with delivery coordination included.
• Project Timelines & Submittals: Need guaranteed delivery dates, formal submittals, or tax-exempt processing?

👉 Request a Commercial Quote or contact our procurement team for direct freight scheduling.