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Core Features & Benefits
Quiet Gasoline Air and Water Heating Kit for RVs and Camper Vans
Designed for gasoline-powered RVs where quiet operation and low battery consumption matter, this kit pairs the Espar Hydronic S3 B5E CS with the Kalori Silencio 2 blower heater. The system supplies up to 17,000 BTU/h (5 kW) for cabin heating and non-potable hot water, while the two-speed Silencio fan consumes only approximately 16 W.
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 gasoline from the vehicle’s fuel tank
Provides 6,140–17,000 BTU/h (1.8–5.0 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 B5E 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 B5E’s maximum 5 kW output.
How the System Works
The B5E burns gasoline 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: Gasoline / petrol
Voltage: 12V
Heat output: 6,140–17,000 BTU/h (1.8–5.0 kW)
Maximum output: approximately 17,000 BTU/h
Maximum fuel consumption: 0.67 l/h (0.18 gal/h)
Hydronic electrical consumption: approximately 7–32 W
