Espar Hydronic S3 D5E CS Diesel 12V Silencio RV Kit with EasyStart Pro Controller

Quiet Diesel Air and Water Heating Kit for RVs and Camper Vans

The Espar Hydronic S3 D5E CS Silencio kit is designed for diesel RVs, camper vans and motorhomes that need dependable heat with minimal cabin noise. It combines a continuously regulated 4,440–17,000 BTU/h diesel heater with the low-power Kalori Silencio 2, providing comfortable cabin heating and support for a separate non-potable hot-water circuit.

The included Kalori Silencio 2 blower heater transfers heat from the coolant into the living space while using only approximately 16 W of electrical power. Its thermostat and two-speed fan provide convenient cabin heat control with low electrical consumption.

A separate 24-plate heat exchanger with a mixing valve can transfer heat to a non-potable water circuit for applications such as washing or showering, subject to local requirements.

Key Benefits

• Uses diesel from the vehicle’s fuel tank
• Provides 4,440–17,000 BTU/h (1.3–5.0 kW) of continuously regulated heat
• Includes a Kalori Silencio 2 blower heater with thermostat
• Two-speed cabin fan consumes approximately 16 W
• Supports non-potable water heating through a separate plate heat exchanger
• Can operate independently or connect to the engine coolant circuit
• Can circulate available engine residual heat without running the burner
• EasyStart Pro provides heater control, timers and diagnostics
• Supports operation up to 9,900 ft (3,000 m) with high-altitude mode
• Fully customizable for different RV heating requirements

Fully Customizable Hydronic Heating

The D5E provides a flexible foundation for a custom RV hydronic system. Additional water-to-air heat exchangers, hydronic radiators, floor-heating loops and separate heating zones can be added when correctly sized and installed.

The system may also be configured for engine preheating or for using residual engine heat while driving or after the engine has been switched off. Additional pumps, valves, manifolds, thermostats and control components may be required.

All heating elements share the Hydronic’s maximum 17,000 BTU/h (5 kW) output. The Kalori Silencio 2 can transfer up to approximately 5.5 kW under specified test conditions, but the complete system remains limited by the D5E’s maximum 5 kW output.

How the System Works

The D5E burns diesel to heat a water-glycol coolant mixture. An external circulation pump moves the hot coolant through the Kalori Silencio 2, plate heat exchanger and any optional heating elements.

The primary coolant and secondary water circuits remain separate and do not mix. The supplied 5-liter tank is an expansion tank for the closed coolant circuit—not a hot-water storage tank.

Non-Potable Water Notice: The included plate heat exchanger is intended for non-potable water applications. Water heated through this component must not be used for drinking, cooking or food preparation. Confirm applicable requirements before using the system for washing or showering. A certified potable-water heat exchanger and compatible plumbing components are required for potable hot water.

Technical Specifications

• Fuel: Diesel
• Voltage: 12V
• Heat output: 4,440–17,000 BTU/h (1.3–5.0 kW)
• Maximum output: approximately 17,000 BTU/h
• Maximum fuel consumption: 0.59 l/h (0.16 gal/h)
• Hydronic electrical consumption: approximately 5–32 W
• Power consumption during startup: approximately 135 W
• Coolant pump consumption: approximately 17 W
• Minimum coolant flow rate: 300 l/h (79.2 gal/h)
• Maximum operating altitude: 9,900 ft (3,000 m)
• Heater dimensions: 215 × 91 × 144 mm
• Heater weight: approximately 2 kg

Part numbers:

• Complete kit: 2528293405000 + RV kit accessories 
• Heater only: 252652050000
• Alternative formats: 25.2829.34.05000; 25.2829.34.05.000; 25 2829 34 05000; 25 2829 34 05 000

Browse Eberspächer/Espar Manuals & Technical Documentation

Kalori Silencio 2:

• Heating capacity: approximately 5.5 kW
• Airflow: approximately 250 m³/h
• Fan speeds: 2
• Electrical consumption: approximately 16 W
• Dimensions: 152 × 321 × 125.5 mm
• Weight: approximately 2 kg

Included in the Kit

• Espar Hydronic 3 D5E Heater 12V
• EasyStart PRO controller
• Kalori SILENCIO 2 5KW blower box with thermostat
• Heater water (expansion) tank 5 Liter
• All electrical harnesses and connections
• Pre-assembled 24 plate Water heat exchanger with mixing valve
• All necessary clips and screws
• 1m exhaust pipe
• 1m combustion Intake pipe
• 4m water hose 16mm ID (Blower Box)
• Water Pump (for coolant circulation in Hydronic)
• Fuel Pump
• Fuel T Piece Kit
• Hydronic Mounting Bracket

Vehicle-specific fuel, coolant, exhaust and installation components may be required. Professional installation is recommended.