Le Tonkinois Varnish

B & D Murkin

UK main importers for

Le Tonkinois varnish

Flexidisc sander


Page 1 covers current Airtronic models D2 D4 D5

Page 2 covers older models D1LCC, D1LC, D1L, B2L, D2L, BN2

Page 3 covers older models D3LCC, D3LC, D3L.

Page 4 covers older models D5LC, D5L, D4L.





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 25 mm

Exhaust outlet pipe 24 mm.

D2 with outlet hood Ø 60 mm, ducting guide number 6

D2 with outlet hood Ø 75 mm, ducting guide number 12

Spare parts availability    Current model

Links for downloading manuals see Manuals page.

Wiring connection details see Wiring page.

Ducting information see Ducting pages.

Full servicing information see Airtronic Service pages.

Fault finding information see Faults pages.

Airtronic D4 & D4 Plus

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 25 mm, Exhaust outlet pipe 24 mm.

Higher heat model of the D2 with similar construction.

D4 with outlet hood Ø 75 mm, ducting guide number 3

D4 with outlet hood Ø 90 mm, ducting guide number 10

D4 Plus with outlet hood Ø 75 mm, ducting guide number 10

D4 Plus with outlet hood Ø 90 mm, ducting guide number 15

Note right angled outlet hood must not be used with D4 Plus, see ducting pages


Spare parts availability    Current model

Links for downloading manuals see Manuals page.

Wiring connection details see Wiring page.

Ducting information see Ducting pages.

Full servicing information see Airtronic Service pages.

Fault finding information see Faults pages.



Airtronic D4 variants

Airtronic D4    Short duct length rating of 3m

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, reduced heat output of about 3 kW,

                              Slower fan speed for lower noise,  different ECU.


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 25 mm

Exhaust outlet pipe 24 mm.

D5 with outlet hood Ø 90 mm, heater guide number 10



The Airtronic D5 construction is significantly different from the Airtronic D2 and D4 models as it is an updated 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 which 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.

Ducting information see Ducting pages.

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 Diesel Air Heater Models



Eberspacher are introducing new air heater models S2 S4


You would have thought they would be keen to promote them on our site and to answer simple technical questions on them. When I contacted Eberspacher UK after our friendly technical guy left the firm his replacement did not want a relationship with us, and said he would get back to me shortly. His version of shortly was over two and a half years and that email was to confirm no co-operation and say users should ask a dealer. I could get most information from other sources but if Eberspacher are not interested in supporting their new heaters why waste my time helping advertising them.

Hence I have made the decision not to include material on those heaters and will not be supporting users of them who have problems. We will continue to advise on the older heaters.


Since we lost Eberspacher co-operation we feel we can now mention cheaper competing products.

Eberspacher price is extremely high for buyers of single heaters.

The 2KW version with full kit looks to be about £800 on eBay 2021, horrendously expensive.

An Airtronic D2 with full kit is about £650 on eBay


Chinese heaters are exceptionally cheap, showing the true price of production.

Chinese diesel heater with full kit about £110 on Amazon 2021.

Chinese heaters quality is lower than Eberspacher but at that price you can buy one and a spare plus if you wanted another 2 spares for those and still be far cheaper than an Eberspacher.




1  Current Eberspacher Heater Models we support


Eberspacher current diesel 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.

Models are produced in 12 or 24 volt versions. The highest heat models are not included.

Read our Buying advice page before buying to avoid very expensive mistakes like non standard heaters.

Click on images for better quality.




Eberspacher Airtronic D2 Heater


Eberspacher D8LC

Eberspacher D2 and D4 heaters together to show size differences. D2 uppermost.








Eberspacher Airtronic D5 Heater

Airtronic D2 fitted with a right angled hood. This can also be fitted sideways or upside down.

Note that fitting a right angled hood will significantly reduce the permitted ducting length & fittings allowance.

Hoods from other models will not fit, even if similar size.

Airtronic D2 heater.

Heating air inlet left, Heated air outlet hood right.

Bottom:- Combustion air inlet, Fuel inlet, Exhaust outlet.

Eberspacher 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.






Eberspacher Airtronic D4   and   D4 Plus Heaters

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The D8LC is only  included here to show higher heat versions are available. Generally these are fitted to larger boats / busses and would presumably be professionally installed & maintained.



Construction is significantly different from Airtronic 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 will apply for all 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


Eberspacher Old 1-3kW Old 3-5kW Old 5-8kW Water heaters Site guide
Top ˄ Home Eberspacher Next >

The reason for having this site is to promote our Le Tonkinois natural varnish and Flexidisc sander products, we hope you will look at those pages as well as these.


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