Description
The Weil McLain 381-356-578 is a purpose-built control transformer designed as a genuine OEM replacement for compatible Weil McLain hydronic heating systems. Stepping voltage down from 120 volts primary to 24 volts secondary at a 40 VA capacity, this transformer delivers the stable, low-voltage power supply that boiler controls, aquastats, and zone panels depend on for accurate, reliable operation.
Installing the correct OEM transformer ensures your Weil McLain system maintains proper control circuit performance, protects sensitive electronic components from voltage irregularities, and supports the long service life your heating system was engineered to deliver.
Key Specifications
- Primary Voltage: 120 Volts
- Secondary Voltage: 24 Volts
- VA Rating: 40 VA
- OEM Part Number: 381-356-578
- Compatible Brand: Weil McLain
Features & Benefits
- Genuine Weil McLain OEM replacement part for assured fit and compatibility
- Provides reliable 24V control power for boiler controls, aquastats, and zone valves
- 40 VA capacity supports standard hydronic control circuit loads
- Helps maintain system efficiency and protects downstream control components
- Direct drop-in replacement minimizes installation time and callbacks
Application
Designed for use with Weil McLain boilers and hydronic heating systems requiring a 120V to 24V step-down transformer. Always verify compatibility with your specific boiler model before installation.
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