Eberspacher AquaSystem 12V RV Water & Air Heating Kit with Touchscreen control

 

Benefits & Use Cases

The Eberspacher Hydronic AquaSystem NA is engineered as a higher-value, fully integrated water and air heating platform for RVs, motorhomes, work vehicles, and similar mobile applications. It is designed to heat the living area and provide hot water for sinks and showers by circulating heated coolant through dedicated air and water heat exchangers.

This setup stands out with a 4.3 in full-color touchscreen, a more robust control architecture, and two Silencio 2 heat exchangers for greater heating capacity, quieter operation, and added redundancy. A metal coolant reservoir with an integrated 120V heating element helps improve cold-weather usability and supports faster warm-up when shore power is available.

• Heats cabin air and domestic water from one integrated 12V hydronic system
• Two Silencio 2 air heat exchangers support stronger and quieter interior heating
• 4.3 in full-color touchscreen improves control, diagnostics, and accessibility
• 120V electric assist adds flexibility for campground and shore-power use
• Built for premium RV, camper, utility, and mobile living installations

Vehicle Compatibility

• Recreational vehicles and motorhomes
• Camper van and overland-style hydronic heating builds
• Work vehicles needing integrated air and water heating
• Utility and specialty mobile applications similar to the above

Technical Specifications

System

• Fuel Type: Diesel or Gasoline
• Voltage: 12V
• Applications: RVs / motorhomes, work vehicles, and similar mobile installations
• Functions: Interior air heating and hot water for sinks and/or showers
• Altitude Compensation: Automatic up to 9800 ft (3000 m)

Hydronic S3 Diesel Heater

• Heater Model: HS3 D5E 12V CS
• Part Number: 25.2993.05.0000
• Voltage: 12V
• Max Heat Output: 17,100 BTU (5.0 kW)
• Min Heat Output: 4,400 BTU (1.3 kW);
• Fuel Consumption: 0.04 to 0.16 gal/h (0.15 to 0.59 L/h);
• Average Power Consumption During Operation: 5 to 32 W;
• Starting Power Draw: 135 W
• Minimum Coolant Flow Rate: 300 L/h
• Dimensions: 215 x 91 x 120 mm (8.5 x 3.6 x 4.7 in)
• Weight: 4.4 lb (2 kg)
• Protection Rating: IP5K6K in operation; IP5K9K not in operation

Hydronic S3 Gasoline Heater

• Heater Model: HS3 B5E 12V CS
• Part Number: 20.2051.05.0000
• Voltage: 12V
• Max Heat Output: 17,100 BTU (5.0 kW)
• Min Heat Output: 6,100 BTU (1.8 kW)
• Fuel Consumption: Gasoline 0.23 to 0.67 L/h (0.06 to 0.18 gal/h)
• Average Power Consumption During Operation: Gasoline 7 to 32 W
• Starting Power Draw: 135 W
• Minimum Coolant Flow Rate: 300 L/h
• Dimensions: 215 x 91 x 120 mm (8.5 x 3.6 x 4.7 in)
• Weight: 2 kg (4.4 lb)
• Protection Rating: IP5K6K in operation; IP5K9K not in operation

Air & Water Heating Components

• Air Heat Exchangers: 2 x Silencio 2
• Silencio 2 Part Number: 83.0012.01.4030
• Silencio 2 Airflow: 250 m³/h each
• Silencio 2 Power Consumption: 16 W each
• Water Heating Method: Double-walled plate heat exchanger with thermostatic mixing valve
• Water Heating Style: On-demand hot water with no storage tank
• Electric Heating Element: 1500 W, 120 VAC
• Coolant Reservoir Volume: Approx. 8 L (2.11 gal)

Controls

• Touchscreen Interface: 4.3 in full-color display
• Touchscreen Part Number: 25.2800.70.0034
• Touchscreen Resolution: 480 x 272
• Touchscreen Operating Voltage: 9 V to 32 V
• Touchscreen Enclosure: IP67
• I/O Controller Part Number: 25.2800.70.0033
• I/O Controller Operating Voltage: 9 V to 32 V
• I/O Controller Maximum Total Current Output: 24 A
• High Altitude Module Part Number: 25.2800.70.0032

Main Part Numbers:

• Complete Diesel Kit: 252800100001
• Complete Gasoline Kit: 252800100002
• Alternative formats: 25.2800.10.0001: 25.2800.10.00.01; 25 2800 10 0001; 25 2800 10 00 01; 25.2800.10.0002; 25.2800.10.00.02; 25 2800 10 0002; 25 2800 10 00 02

Kit Includes

• Hydronic 12V heater unit
• Coolant pump
• Fuel metering pump
• 4.3 in touchscreen display
• I/O control module
• Double-walled plate heat exchanger
• Coolant tank with heating element
• Thermostatic mixing valve
• Thermostat switch
• 2 x Silencio 2 air heat exchangers
• High altitude module
• Exhaust / intake hose
• Coolant hose
• Exhaust silencer
• Wiring harness
• Installation hardware including fastening parts, cable ties, and holders

Browse Eberspächer/Espar Manuals & Technical Documentation

Note: The included coolant hose is sufficient for a basic installation. Additional coolant hose is recommended when connecting external components or extending the system layout.

FAQs

Can the AquaSystem heat cabin air and hot water at the same time?
Yes. The system is designed to heat the living area and provide hot water for sinks and showers through separate heat exchangers in one coolant-based setup.

Is this available in both diesel and gasoline versions?
Yes. The AquaSystem NA is offered as a 12V diesel kit and a 12V gasoline kit, both based on the Hydronic S3 platform.

Does it support electric heating when plugged into shore power?
Yes. The coolant reservoir includes a 1500W 120V electric heating element for lower-demand heating situations when grid power is available. 

How does it perform at altitude?
The system uses a high altitude module and automatically compensates up to 9800 ft (3000 m) to support more consistent heater operation. 

How is hot water temperature controlled?
Hot water passes through a thermostatic mixing valve before reaching the fixtures, helping deliver more controlled outlet temperature.