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Eberspacher Airtronic D4 Diesel Marine Cabin Heater 4Kw - 12V

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Perfect for heating and keeping your boat dry!

The Airtronic D4 is a more powerful version of the D2 for larger scale heating enviroments whilst only being slightly larger offers optimised fuel efficiency, a range of operation modes and unsurpassed safety standards.

*Ducting kit included*

*Standard controller included*



  • Factory assembled components for easy ”Plug in Play” installation
  • Full range of ducting accessories including windscreen demisters
  • Electronic speed control with gentle adjustment
  • Fully electronic microprocessor control with continuous monitoring
  • Fan function possible for air circulation
  • Diagnostic system for easy fault finding by our service dealers
  • Low power and fuel consumption
  • Includes standard controller (801 series) that can do the following:
  • Ambient and set point temperatures
  • Built in room sensor
  • System diagnostics



  • Voltage: 12V
  • Heat Settings: Power, High, Medium, Low
  • Heat Flow: Power: 4000W High: 3000W Medium: 2000W Low: 1000W
  • Air Throughput M3/h: Power: 150 High: 130 Medium: 95 Low: 55
  • Electrical Power: Power: 40W High: 24W Medium: 13W Low: 7W
  • Consumption: Power: 3.33 Amps High: 2.0 Amps Medium: 1.08 Amps Low: 0.58 Amps
  • Fuel Consumption: Power: 0.51 l/h High: 0.38 l/h Medium: 0.25 l/h Low: 0.13 l/h
  • Dimensions (LxWxH): 371x150x140
  • Weight: 4.5 kg


How an Eberspächer air heater works:

The heater is supplied with fuel directly from the boat's tank. The fan of the heater draw fresh air in and blows the heated air into the cabin. In summer the fan can be used for fresh air supply only without heating. They draw in cool room or outside air, heat this up and then deliver it to the interior of the vehicle.

Air heaters are an excellent solution for commercial vehicles of every type. They can be installed just as well in the cab as in the luggage compartment or under the floor.

Scientists have found that one feels best at an ambient temperature of 22°C and a relative humidity of 60%. In addition to this comfort range according to DIN 1946, a minimum fresh air rate of 20 m3 (non-smokers) or 20 m3 (smokers) per person and hour is required. Optimum wellbeing on board is guaranteed with Eberspächer air heaters. Our sophisticated heaters delivery exactly the right amount of heat. And solutions such as the D5L C bring it to an impressive 233 m3 of air per hour.



  • Non-closable inlet air grill for 80mm ducting x 1
  • D4 Plus Airtronic heater complete (12vdc) x 1
  • Heater duct hood for 75mm for 80 mm ducting x 1
  • Non-closable outlet air grill for 80mm ducting x 1
  • Ducting 80mm x 7
  • Fuel standpipe – fuel pick-up –600mm long x 1
  • Marine fuel kit x 2
  • Fuel Line 4mm O/D Copper x 4
  • Fuel line connector – 3.5 x 3mm 50mm x 8
  • Hose clip – 9mm x 1
  • D4 Mounting plate, stainless steel x 4
  • Hose clips for 80mm ducting x 1
  • 76mm “Y” connector for 80mm ducting x 1
  • Combustion air silencer x 1
  • Closable and rotatable outlet for 80mm ducting x 2
  • 801 Series controller with temp sensor and 6m loom x 1
  • Built in diagnostic function x 1
  • Fuel dosing pump x 1
  • Fuel dosing pump holder-rubber x 1
  • Bracket – Angle for Fuel Meter Pump x 1
  • Combustion air silencer x 1
  • Duct hose clip-20-32mm for combustion air tube x 1
  • Combustion air silencer mounting bracket x 1
  • Duct clip for 80mm ducting x 4
  • 2m Marine exhaust with lagging and outer cover x 1
  • Wiring loom complete with fuses x 1
  • Exhaust pipe mounting “P” clips x 2
  • Fuel dosing pump loom 6m x 1
  • Exhaust through hull fitting with mounting gear x 1
  • Exhaust pipe clamps x 2
  • Cable ties for general installation x 10

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