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Eberspacher Diesel Air Heater Models
Airtronic D2 Heater




Servicing photos.

If you service a model we have not fully covered here we would like to incorporate the details and photos to help others.
We would need a full set of good or at least reasonable quality pictures and a description of each stage.
Ideally photos should be high resolution as possible, preferably the original unedited and uncropped versions, on a cd or dvd if too big to send by email.
I can edit, add arrows etc. We always acknowledge the source of such photos.

If your heater is really carboned up we would welcome detailed photos to add to our pages.
Photos of specific problems are also of interest.


Manufactured 2003* onwards, current model.

Automatic settings      Boost   High   Med   Low   Standby.
Heat output                 2200   1800   1200   850    0  watts.
Fuel consumption        0.28    0.23    0.15   0.10    0   l/hr.
Power consumption        34      22       12      8      5   watts
Current 12v approx           3       2         1     0.6    0.5  amps
Current 12v start, glow pin on, 10 amps for about 3 minutes
Current 12v heater off     0 amps
Length 310,  Width 115,  Height 112      mm
Combustion air inlet pipe 25mm, Exhaust outlet pipe 24mm.

Spare parts availability    Current model
Links for downloading manuals see Manuals page.
Wiring connection details see Wiring page.
Full servicing information see Airtronic Service pages.
Fault finding information see Faults pages.
Manufactured 2003* onwards, current model.

Automatic settings      Boost   High   Med   Low   Standby.
Heat output                 4000   3000   2000   900    0  watts.
Fuel consumption        0.51    0.38    0.25   0.13   0   l/hr.
Power consumption       40      24       12       7      0   watts
Current 12v approx        3.5       2         1     0.5     0  amps
Current 12v start, glow pin on, 10 amps for about 3 minutes
Length 376,  Width 140,  Height 150      mm.
Combustion air inlet pipe 25mm, Exhaust outlet pipe 24mm.
Higher heat model of the D2 with similar construction.

Airtronic D4 variants
Airtronic D4 Plus - Larger motor and fan blades for longer air heating pipe runs, different ECU.
Airtronic D4S, D4 Camper or Airtronic D3 - Not sold in UK.
    Slower fan speed for lower noise.
    Reduced heat output of about 3KW.


Spare parts availability    Current model
Links for downloading manuals see Manuals page.
Wiring connection details see Wiring page.
Full servicing information see Airtronic Service pages.
Fault finding information see Faults pages.
Airtronic D5 Heater





Airtronic D4 and D4 Plus Heaters





Manufactured 2005* onwards, current model.

Automatic settings      Boost   High   Med   Low   Standby.
Heat output                 5500   4800   2700   1500    0  watts.
Fuel consumption        0.75    0.65    0.37    0.27    0   l/hr.
Power consumption       85      80       30      15      0   watts
Current 12v approx         7      6.5      2.5        1       0  amps
Current 12v with glow pin on during start   approx 21 amps
Length 530,  Width 170,  Height 185      mm.
Combustion air inlet pipe 25mm
Exhaust outlet pipe 24mm.

The Airtronic D5 construction is significantly different from the D2 D4 models as it retains most of the older D5LC design.
Heat exchanger, glow pin and screen are D5LC type.
Essentially it is the D5LC body fitted with a new ECU and the separate sensors replaced by a combined sensor.
It does not have the lower start current advantages and the easier servicing of the other Airtronic models.
Higher start current needs thicker power supply cables.
The smaller grommet on the upper case gives access to a rotary valve. It is in the combustion air feed to set the fuel mixture. Treat it as a factory setting and leave alone unless a gas analyser is available.


Spare parts availability    Current model.
Links for downloading manuals see Manuals page.
Wiring connection details see Wiring page.
Fault finding information see Faults pages.
Servicing details for the Airtronic D5 differ from the other Airtronic models and are included on our servicing pages.
Photographs showing each stage during servicing would be welcome for including on our site.






Eberspacher current diesel air heater models with brief details, for older models see the other pages.
* Dates are a general indication only, nearly all are very much best guesses as date information is not published.
The data is a quick guide for users buying second hand heaters, check with the Eberspacher manuals if it is critical.
The highest heat models are not included.  Airtronic D3 model is not sold in the UK.
Models are produced in 12 or 24 volt versions.
Read our Buying advice page before buying to avoid very expensive mistakes.

D8LC





Automatic Settings      High   Low   Standby.
Heat output                 8000   3500     0  watts.
Fuel consumption        1.05     0.4      0   l/hr.
Power consumption     115    115      0   watts
Current 12v approx        10       10      0  amps
Current 12v with glow pin on during start   approx 27 amps
Length 653,  Width 260,  Height 250      mm.
Combustion air inlet pipe 30mm, Exhaust outlet pipe 42mm.
Manufactured ????* onwards, current model.

Construction is significantly different from D2 D4 models.
The 7 day timer manual mentions its output needs a relay fitted as the D8LC carries a load on the switch wire, this presumably also applies to other controllers.
Unlike the Airtronic heaters the D8LC does not have an internal temperature sensor and it always requires an external sensor fitted. It will not work without it

It is included here just to show higher heat versions are available. Generally it would be fitted to larger boats / vehicles and would presumably be professionally installed & maintained.

Eberspacher D2 and D4 heaters together to show size differences. D2 uppermost.
Airtronic D2 fitted with the less common right angled hood.
The hood can also be fitted sideways or upside down.
Note that fitting a right angled hood can take up to half the permitted hose length & fittings allowance.
Hoods from other models will not fit, even if similar size.


1  Current Eberspacher Heater Models
Airtronic D2 heater.
Heating air inlet left, Heated air outlet hood right.
Bottom:- Combustion air inlet, Fuel inlet, Exhaust outlet.
Click on images for better quality.
Page 2 continues with older models D1LCC, D1LC, D1L, B2L, D2L, BN2.

Page 3 continues with older models D3LCC, D3LC, D3L.

Page 4 continues with older models D5LC, D5L, D4L.

Airtronic D3 Heater (D4 camper)





The Airtronic D3 heater model is not sold in the UK.
It is a de-tuned Airtronic D4 with a slower motor speed, it was designed as a quieter heater for campervans.
They only have a duct rating factor of 3m, so not normally used in boats.
The parts are all the same as the Airtronic D4 except for the ECU.