Cold starts place added stress on diesel engines, batteries, and emissions components. The Eberspächer Hydronic HS3 CS D5E addresses this issue by preheating engine coolant before startup. As a result, engines warm more quickly, start easier, and operate more efficiently in cold environments.
This 12V diesel coolant heater delivers up to 5.0 kW (approximately 17,100 BTU) of heating output. Because it heats the coolant directly, warmth is distributed through the engine block and the vehicle’s HVAC system without requiring the engine to run.
The CS (Commercial Series) configuration supports advanced control options and diagnostic capability. In addition, this installation kit includes the essential components required for proper fuel delivery, coolant circulation, exhaust routing, and mounting. This simplifies installation and ensures consistent performance in fleet and professional applications.
By reducing idle time and cold-start emissions, the Hydronic HS3 also helps support longer service life for DOC and DPF systems.
Key Features & Benefits
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Produces up to 17,100 BTU (5.0 kW) of diesel-fired coolant heat
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Reduces cold-start engine wear
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Improves winter starting 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 use
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Complete installation kit simplifies setup
What’s Included
This installation kit includes:
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Hydronic HS3 CS D5E 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 D5E
Voltage: 12V
Fuel Type: Diesel (EN 590; up to 30% FAME permitted)
Heating Medium: Engine coolant (water / antifreeze mixture)
Maximum Heat Output: 5.0 kW (≈ 17,100 BTU)
Fuel Consumption: Approximately 0.15 – 0.59 L/hr
Electrical Power Consumption (Heater): 5 – 32 W
Electrical Power Consumption (Water Pump): 17 W
Electrical Power Consumption (Start): 135 W
Minimum Coolant Flow Rate: 300 L/hr
Control Type: Infinitely variable heat control
Compliance: EPA Verified
Applications
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Light- and medium-duty diesel 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 12V 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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