Auxiliary interior heater - How does it work? - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 10-19-2004, 07:50 AM Thread Starter
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Auxiliary interior heater - How does it work?

I have bought an ex-Germany W124 500E that has the auxiliary pre-heater with the control panel just forward of the gear lever. It doesn't seem to work but no-one seems to have any info on it and the dealers stare blankly as they haven't seen one.I foundthis reference to the heater on an obscure web page that describes its operation but I need nore detail on the workings and parts.-

'The auxiliary heater (Zusatzheizung, code 228) is a separate heating
system that works independently of the engine. It consists of a
separate burner unit, an electric water pump, a control unit and it
is connected to the coolant circulation of the engine. It is run on
the fuel of the car (either diesel or petrol, these are different
units for obvious reasons) with a separate fuel line from the tank.
This makes it independent from an electrical outlet and from the
engine. It is started either manually, with a timer (mounted on the
center console or in the glovebox) or via a powerful FM-wireless
remote (the Mercedes units for from about 500 to 1000 metres
depending on local circumstances. The latest versions are available
with mobile phone remote control as well.

Once it is started, a spark plug ignites the burner which heats the
coolant up and the water pump recirculates the water through the
engine. The system heats the coolant up to 80°C and works until that
temperature is held in circulation. Once the temperature of 55°C is
achieved, a separate relay starts the heater blower and this heats up
the interior.

Even at very low temperatures in Alpine or Siberian regions, this
heats up the engine and the interior within 20-30 minutes. Apart from
a warm seat when you step in, the heat melts all snow and ice on the
windows without further ado.

Very comfortable and a must in Southern Germany, Switzerland and

Many German Taxis have it as well since it helps them keep warm in
Winter when the wait and have no engine running.'

I still need some info to get mine working as well as instructions to work it, so if this rings a bell with anyone I'd love to know.


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post #2 of 4 (permalink) Old 10-19-2004, 08:51 PM
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RE: Auxiliary interior heater - How does it work?

There are two companies where the heater might have been supplied from. Here are the web sites where you can contact them:

Also look at this:

Hillside Imports is bringing Standheizungen to the US (Factory OEM Option offer for VW and Audi). A basic translation is Parking Heater. The is a really cool unit that is offered as an option in Germany and most of the world. I had it on the Phaeton this last December in Germany, The unit is really handy you can set warm up times at different times of the day in which a small furnace which runs off the cars fuel system is switched on. This unit when switched on preheats engine coolent and circulates through the engine block and heater core and when the coolent reaches a certian temp, the HVAC fan in side the car is switched on and heats the entire car inside. Very nice for cold weather because is also defrosts all the windows also, another nice point of it as it works on manuals just as easy as it does on automatic because the unit does not start the engine. There are a few options that you can add to the unit. One is the options is a Remote control which works up to 600M away from the car, the other option is called Thermo Call, this allows you to phone your car and schedule a time you want the unit to switch on and preheat the car.
I will tell you this is the best and most functional feature I have ever used on a car. Once you have the unit you will not want to be without it.

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post #3 of 4 (permalink) Old 10-28-2004, 04:39 AM Thread Starter
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RE: Auxiliary interior heater - How does it work?

I have had contact from webasto who supplied the heater to MB and have subsequently obtained some pdf's of the operating instructions as well as a full manual for servicing and troubleshooting. The model no. is bbw46

I hope this will enable me to get my heater working and contact me if you wish me to email the pdf's to you.


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post #4 of 4 (permalink) Old 10-28-2004, 07:16 AM
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RE: Auxiliary interior heater - How does it work?

if i was you i would contact steve (mbenznl) and ask him. he supplied sunman (a member over at mb world) with all the auxiliary heater parts so that he could retrofit them into his w203 sedan. you could also do a search over there too, sunman did a really nice write up with pics and everything.
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