The glow pin generates the heat needed to initiate combustion during heater startup. A damaged, worn or contaminated glow pin may contribute to unsuccessful starts and other ignition-related operating problems.

Part 252106011300 is also formatted as Eberspächer part number 25.2106.01.1300. It is designed for compatible 12-volt Hydronic D4WSC and D5WSC heaters and replaces historical glow-pin part number 252106011000.

The attached cable and electrical terminals provide the connection between the glow pin and the heater’s electrical system.

The 252121990113 glow-pin lining should be inspected when replacing the glow pin. A more complete repair may also require the 201820990001 burner and blower gasket set, 252216100000 Hydronic burner, 201819991600 combustion blower or 251920370000 flame sensor.

Always confirm the heater model, voltage and complete heater number before ordering. This is a 12-volt glow pin and should not be substituted for the corresponding 24-volt component.

Key Features

• Replacement glow pin with attached cable
• Designed for compatible Hydronic coolant heaters
• 12-volt electrical configuration
• Fits compatible D4WSC heaters
• Fits compatible D5WSC heaters
• Replaces historical part number 252106011000
• Supplies ignition heat during heater startup
• Common service component for ignition-system repairs
• Connects to the heater through attached electrical leads
• Suitable for professional heater maintenance and repair

Specifications

• Part Number: 252106011300
• Formatted Eberspächer Number: 25.2106.01.1300
• Historical Part Number: 252106011000
• Product Type: Glow pin with cable
• Voltage: 12V
• Primary Function: Heater ignition
• Heater Type: Diesel-fired coolant heater
• Heater Family: Hydronic
• Compatible Model Families: D4WSC and D5WSC
• Installation Location: Internal ignition and combustion assembly
• Electrical Connection: Attached cable and terminals
• Brand: Eberspächer/ESPAR
• Condition: New replacement part
• Unit of Measure: Each
• Glow-Pin Lining: Sold separately unless specifically included

Compatible Eberspächer/ESPAR Heaters

Part 252106011300 is intended for compatible 12-volt versions of:

• Eberspächer Hydronic D4WSC
• ESPAR Hydronic D4WSC
• Eberspächer Hydronic D5WSC
• ESPAR Hydronic D5WSC
• Hydronic D5WS applications specified for this glow pin
• Other compatible Hydronic heaters using part 25.2106.01.1300
• Applications previously using part 252106011000 where 252106011300 is the specified replacement

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

This glow pin should not be assumed compatible with:

• 24-volt Hydronic heaters
• Airtronic air heaters
• Hydronic S3 heaters requiring a different glow pin
• Applications requiring a different Eberspächer part number
• Heaters that have not been positively identified

Common Service Applications

The glow pin may require replacement when:

• The heater does not ignite
• The heater experiences repeated unsuccessful starts
• Electrical testing identifies a glow-pin failure
• The glow pin is damaged
• The glow pin is heavily contaminated
• The attached cable or terminals are damaged
• The heater is undergoing combustion-system service
• The burner assembly is being serviced
• The heater is undergoing a comprehensive rebuild
• A technician has diagnosed the glow pin as the failed component

A no-start condition or fault code does not automatically confirm glow-pin failure. The heater should be properly diagnosed before replacement parts are ordered.

Important Installation Notes

• Confirm that the heater operates on 12 volts.
• Confirm the complete heater model and heater number.
• Disconnect electrical power and fuel before servicing the heater.
• Allow the heater and coolant system to cool before disassembly.
• Inspect the 252121990113 glow-pin lining during service.
• Replace a damaged or contaminated glow-pin lining.
• Inspect the burner and combustion chamber while the heater is open.
• Inspect the attached cable, terminals and mating connections.
• Inspect all disturbed gaskets and seals before reassembly.
• Replace damaged, compressed or deteriorated sealing components.
• Install the glow pin in the correct position.
• Route the cable according to the heater’s original configuration.
• Do not substitute a 24-volt glow pin.
• Test heater operation after completing the repair.
• Heater service should be performed by a technician familiar with diesel-fired coolant heaters.

Related Products

• 252121990113 – Eberspächer/ESPAR Hydronic D4W/D5W Glow-Pin Lining
• 201820990001 – Eberspächer/ESPAR Hydronic D4/D5 Burner and Blower Gasket Set
• 252216100000 – Eberspächer/ESPAR Hydronic D4W/D5W Burner
• 201819991600 – Eberspächer/ESPAR 12V Combustion Blower
• 251920370000 – Eberspächer/ESPAR Hydronic D5 Flame Sensor
• 2522190123002 – Eberspächer/ESPAR Overheat Sensor with Cable
• 252219250000 – Eberspächer/ESPAR 12V Preassembled Coolant 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