Replacement Heater Core

Replacement tube and fin heater core for HeaterCraft 300H and 400H hydronic marine heatersfeaturing a 5/8″ hose barb connection and a 1-tube fin style core.

Key Features

• Replacement tube and fin heater core for HeaterCraft 300H and 400H hydronic heater systems
• 5/8″ hose barb connection
• Includes 1-Tube and fin style heater core

Intended Use

• HeaterCraft 300H hydronic heater systems (heater core replacement)
• HeaterCraft 400H hydronic heater systems (heater core replacement)
• Hydronic cabin heating/comfort ventilation systems that use a tube-and-fin heater core with a 5/8″ hose barb connection

Product Details

• – Replacement tube and fin heater core for 300H and 400H hydronic heater
• – Hose connection: 5/8″ hose barb
• – Core style: 1-Tube and fin style heater core
• – Variant SKU: 760-H301

Parts Desk Insights

Best Use Case: Best for restoring cabin heat output when the existing hydronic heater core is leaking, plugged, or no longer transferring heat effectively.

Common Issues: Typical replacement jobs require careful inspection of hose routing and mating hose barb condition; verify the hose size/fitment at both inlet and outlet and re-check for leaks after installation.

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