Cold starts accelerate engine wear and strain emissions systems. The Eberspächer Hydronic HS3 CS D6L solves this by preheating engine coolant before startup. As a result, engines start easier, warm faster, and operate more efficiently in cold conditions.
This 24V diesel coolant heater provides up to 5.6 kW (approximately 17,100 BTU) of heating output. Because it heats the coolant directly, warmth is distributed through the engine block and vehicle HVAC system rather than relying on engine operation.
The CS (Commercial Series) configuration supports advanced control and diagnostic capabilities, making it well suited for fleet and professional applications. In addition, this installation kit includes the core components required for proper mounting, fuel delivery, coolant circulation, and exhaust routing.
By reducing extended idling and cold-start emissions, the Hydronic HS3 also helps support longer DOC and DPF service intervals.
Key Features & Benefits
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Produces up to 17,100 BTU (5.6 kW) of diesel-fired coolant heat
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Reduces cold-start engine wear and battery strain
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Improves cold-weather reliability
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Helps minimize idle time and fuel consumption
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Supports faster cab heat through the vehicle HVAC system
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EPA Verified for on-road commercial use
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Complete installation kit simplifies setup
What’s Included
This installation kit includes:
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Hydronic HS3 CS D6L diesel coolant heater
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Wiring harness
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Fuel metering pump (FMP)
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Coolant circulation pump
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Fuel system components
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Mounting bracket and hardware
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Exhaust pipe, clamps, and brackets
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Combustion air intake pipe
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Installation manuals
Technical Specifications
Heater Model: Hydronic HS3 CS D6L
Voltage: 24V
Fuel Type: Diesel (EN 590; blends up to 30% FAME permitted)
Heating Medium: Engine coolant (water / antifreeze mixture)
Maximum Heat Output: 5.6 kW (≈ 17,100 BTU)
Fuel Consumption: Approximately 0.15 – 0.65 L/hr
Electrical Power Consumption (Heater): 5 – 37 W
Electrical Power Consumption (Water Pump): 11 W
Electrical Power Consumption (Start): 135 W
Minimum Coolant Flow Rate: 300 L/hr
Control Type: Minimum / Maximum heat stages
Compliance: EPA Verified
Applications
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Heavy-duty commercial trucks
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Fleet vehicles operating in cold climates
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Diesel-powered equipment requiring engine preheat
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Applications seeking reduced idling and emissions
Installation Notes
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Designed for 24V diesel systems only
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Integrates directly into the engine coolant loop
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Professional installation is strongly recommended
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Controllers and timers are selected separately based on application
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