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Eberspacher Diesel Water Heater Models
Hydronic D4WS & D5WS 24v Heaters
D4WSC & D5WSC 12v Heaters
1 Current Water Heaters
Eberspacher current water heater models with brief details, for older models see the other pages.
Heater models with a Z in the number are OEM heaters and are often non standard, see OEM page.
Our practical knowledge of water based heaters is limited so these pages will not be as comprehensive as the air models. Manufacturing date information is not published, our only information is the dates of manuals or on heater labels.
Technical information given is just a quick guide, check with manual or dealer is it is critical. If heaters have a servicing page any extra information will be found there, otherwise it will be included on these pages.
Some water heaters are not manufactured in both 12 and 24 volt versions.
Any information on dates of your heater label is welcome as are photographs of heaters.
Read our Buying advice page before buying to avoid very expensive mistakes.
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Hydronic MII - M8 M10 M12 Heaters
Hydronic LII16 LII24 LII30 LII35 Heaters
Unlike smaller Eberspacher heaters, Eberspacher LII heaters pump fuel into the burner under pressure.
Eberspacher advise these heaters should be installed and serviced professionally.
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Right top to bottom:-
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Cutaway MII heater on Eberspacher stand at Southampton boat show 2012.
The manuals for the MII heater range reveal a few details of interest.
The current drawn by the M8 model is higher than the M10 and M12 to help burn off Bio diesel deposits. The M12 has a high number of heating power steps and is believed to be a later model.
Combustion air fan and water pump have electrically commutated motors. That means the motors have no brushes, the armature is driven magnetically. Theoretically this should result in less motor failures so good news. The bad news is the blower motor and the ECU are a single unit, if either fail the complete unit has to be replaced.
When replacing a MI heater with an MII a conversion wiring kit is required. Both use the same connector but due to a big cockup the pin connections on the new heaters are rotated 180 degrees so for example a pin that should be top left is bottom right. No damage occurs if a new heater is plugged into an old loom, it just does not work. Oops!!
Hydronic II - D4S D5S D5SC Heaters
These heaters are currently not being sold in the UK for technical reasons but are being sold in Europe.
D4WS (24v)
Manufactured ???? onwards, current model.
Technical Installation manual 2011
Troubleshooting & repair manual 2011
Parts manual 2008, 2011
Known dates on labels 2012
Automatic settings Start High Low Standby
Heat output 4300 2400 0 watts
Fuel consumption 0.53 0.27 0 l/hr
Power consumption 110 35 10 8 watts
Power water pump < 15 watts
Water throughput at 0.1 bar 800 ± 100 l/hr
Water pump, Fuel pump External
Minimum water flow rate 250 l/hr
Length 220 Width 86 Height 102 mm
Combustion air inlet pipe 20 mm
Exhaust outlet pipe 24 mm
Manuals show heaters as 12v but are normally 24v.
Spare parts availability Current model.
Servicing see Hydronic servicing page.
Wiring connection details see manuals.
Fault finding information see Faults pages.
D5WS (24v)
Manufactured ???? onwards, current model.
Technical Installation manual 2007, 2011
Troubleshooting & repair manual 2011
Parts manual 2011
Automatic settings Start High Low Standby.
Heat output 5000 2400 0 watts
Fuel consumption 0.62 0.27 0 l/hr
Power consumption 110 37 10 8 watts
Power water pump < 15 watts
Water throughput at 0.1 bar 850 l/hr
Water pump, Fuel pump External
Minimum water flow rate 250 l/hr
Length 220 Width 86 Height 102 mm
Combustion air inlet pipe 20 mm
Exhaust outlet pipe 24 mm
Manuals show heaters as 12v but are normally 24v.
Spare parts availability Current model.
Servicing see Hydronic servicing page.
Wiring connection details see manuals.
Fault finding information see Faults pages.
D4WSC (12v)
Manufactured ???? onwards, current model.
Technical Installation manual 2003, 2011
Troubleshooting repair manual 2002, 2008
Parts manual 2007, 2008
Label dates 2008, 2011 (2001/2/3 shown in repair manual)
Automatic settings Start High Low Standby
Heat output 4300 2400 0 watts
Fuel consumption 0.53 0.27 0 l/hr
Power consumption 120 48 23 8 watts
Water pump, fuel pump* Internal
*Fuel pump can be re-
Water throughput at 0.1 bar 900 ± 100 l/hr
Minimum water throughput 250 l/hr
Length 220 Width 86 Height 160 mm
Combustion air inlet pipe 20 mm
Exhaust outlet pipe 24 mm
Servicing plus more information see Hydronic servicing page.
Spare parts availability Current model.
Wiring connection details see manuals.
Fault finding information see Faults pages.
D5WSC (12v)
Manufactured ???? onwards, current model.
Technical Installation manual 2003, 2011
Troubleshooting repair manual 2002, 2008
Parts manual 2007, 2008
Label dates 1998
Automatic settings Start High Low Standby
Heat output 5000 2400 0 watts
Fuel consumption 0.62 0.27 0 l/hr
Power consumption 120 48 23 8 watts
Water pump, fuel pump* Internal
*Fuel pump can be re-
Water throughput at 0.1 bar 0 ± 100 l/hr
Minimum water throughput 250 l/hr
Length 220 Width 90 Height 160 mm
Combustion air inlet pipe 20 mm
Exhaust outlet pipe 24 mm
Servicing plus more information see Hydronic servicing page.
Spare parts availability Current model.
Wiring connection details see manuals.
Fault finding information see Faults pages.
Hydronic M8 Biodiesel
Auto settings Power Large Med Small Standby
Heat output 8000 5000 3500 1500 0 watts
Fuel consumption 0.90 0.65 0.40 0.18 0 l/hr
Power consumption 55 46 39 35 32 watts
Power starting 200 watts
M8 is bio diesel compatible.
Hydronic M10
Auto settings Power Large Med Small Standby
Heat output 9500 8000 3500 1500 0 watts
Fuel consumption 1.20 0.90 0.40 0.18 0 l/hr
Power consumption 86 60 39 35 32 watts
Power starting 120 watts
Hydronic M12
Auto Power Large Med1 Med2 Med3 Small Standby
Heat out 12000 9500 8000 3500 1500 1200 0 watts
Fuel 1.50 1.20 0.65 0.40 0.18 0.10 0 l/hr
Power 120 132 86 46 39 35 34 watts
Power starting 120 watts
All models
Manufactured ???? onwards, current models.
Technical Installation manual 2012
Troubleshooting repair manual 2009
Parts manual 2009
Fuel pump External
Water pump External fixed on heater
Water throughput at 0.14 bar 1400 l/hr
Minimum water throughput 500 l/hr
Available in 12 or 24 volt versions.
Length 331 Width 138 Height 220 mm
Combustion air inlet pipe 24.5 mm
Exhaust outlet pipe 29 mm
The ECU determines the model, all other parts are the same.
Spare parts availability Current models
Wiring connection details see manuals.
Servicing see Troubleshooting manual.
Fault finding information see Faults pages.
Combustion air fan and water pump have electrically commutated motors.
