The blower supplies air to the heater’s combustion system. Controlled airflow is essential for proper ignition, stable combustion and reliable heater operation.

Part 201819991600 is also formatted as Eberspächer part number 20.1819.99.1600. Historical references may identify the blower as part number 201759991500.

This blower is used with specified Hydronic D4WSC, D5WSC, D5WS, B5WSC, B5WS and related heater configurations. Compatibility depends on the heater’s complete identification number and voltage.

Blower replacement requires opening the heater and separating internal combustion components. The 201820990001 burner and blower gasket set should be inspected and replaced as required during reassembly.

Other related service components include the 252216100000 Hydronic D4W/D5W burner, 252121990113 glow-pin lining, 252106011300 12V glow pin, 251920370000 flame sensor and the appropriate Hydronic control unit.

Always confirm the complete heater model, voltage and identification number before ordering. Similar Hydronic heater names do not guarantee identical blower assemblies.

Key Features

• Replacement combustion-air blower motor
• Designed for compatible Hydronic coolant heaters
• 12V electrical configuration
• Fits specified Hydronic D4WSC applications
• Fits specified Hydronic D5WSC applications
• Compatible with additional specified D5W and B5W heaters
• Supplies airflow to the combustion system
• Supports ignition and stable heater combustion
• Suitable for heater repair and rebuilding
• Genuine Eberspächer/ESPAR replacement component

Specifications

• Part Number: 201819991600
• Formatted Eberspächer Number: 20.1819.99.1600
• Historical Part Number: 201759991500
• Product Type: Combustion-air blower motor
• Voltage: 12V
• Primary Function: Supplies air to the heater’s combustion system
• Heater Type: Fuel-operated coolant heater
• Heater Family: Hydronic
• Compatible Model Families: D4WSC, D5WSC, D5WS, B5WSC and B5WS
• Installation Location: Internal combustion assembly
• Brand: Eberspächer/ESPAR
• Condition: New replacement part
• Unit of Measure: Each
• Gaskets: Sold separately unless specifically included

Compatible Eberspächer/ESPAR Heaters

Part 201819991600 is identified for compatible 12V versions of:

• Hydronic D4WSC
• Hydronic D5WSC
• Hydronic D5WS
• Hydronic D5W
• Hydronic D5WZ
• Hydronic B5WSC
• Hydronic B5WS
• Hydronic B5W
• Hydronic B5WZ
• Other Hydronic heaters specifically requiring blower 20.1819.99.1600

Compatibility should be confirmed using the complete heater identification number before ordering.

This blower should not be assumed compatible with:

• 24V Hydronic heaters
• Airtronic air heaters
• Hydronic S3 heaters
• Hydronic M-II heaters
• Applications requiring a different blower part number
• Heaters that have not been positively identified

Common Service Applications

The combustion-air blower may require replacement when:

• The blower motor does not operate
• Blower operation is intermittent
• Electrical testing identifies a motor failure
• The blower wheel or motor is physically damaged
• The electrical leads or terminals are damaged
• Required combustion airflow is not being produced
• The heater repeatedly fails to ignite
• The heater experiences combustion-related shutdowns
• The heater is undergoing a comprehensive rebuild
• A technician has diagnosed the blower as the failed component

A no-start condition or heater fault does not automatically confirm blower failure. The wiring, fuel system, glow pin, burner, sensors and other heater components should be inspected as part of the diagnosis.

Important Installation Notes

• Confirm that the heater operates on 12 volts.
• Confirm the complete heater model and identification number.
• Do not substitute a 24V blower.
• Disconnect electrical power and fuel before service.
• Allow the heater and coolant system to cool before disassembly.
• Inspect the blower wiring and electrical connections.
• Inspect the blower wheel and surrounding housing for damage or contamination.
• Inspect the 201820990001 burner and blower gasket set during service.
• Replace damaged, compressed or deteriorated seals.
• Inspect the burner, glow pin and glow-pin lining while the heater is open.
• Clean the mating surfaces without damaging the heater housing.
• Install the blower in the correct position and orientation.
• Confirm that the combustion-air and exhaust paths are unobstructed.
• Refill and bleed the coolant circuit as required.
• Test heater operation after completing the repair.
• Service should be performed by a technician familiar with diesel-fired coolant heaters.

Related Products

• 201820990001 – Eberspächer/ESPAR Hydronic D4/D5 Burner and Blower Gasket Set
• 252216100000 – Eberspächer/ESPAR Hydronic D4W/D5W Burner
• 252121990113 – Eberspächer/ESPAR Hydronic D4W/D5W Glow-Pin Lining
• 252106011300 – Eberspächer/ESPAR Hydronic D4WSC/D5WSC 12V Glow Pin
• 251920370000 – Eberspächer/ESPAR Hydronic D5 Flame Sensor
• 2522190123002 – Eberspächer/ESPAR Overheat Sensor with Cable
• 252219250000 – Eberspächer/ESPAR 12V Preassembled Pump
• 221000700006 – Eberspächer/ESPAR Coolant-Pump O-Ring
• 225201040011 – Eberspächer/ESPAR Hydronic D5 12V Control Unit
• DH-E2000-MAINT – Eberspächer/ESPAR Hydronic D5 12V Maintenance Kit