Operation Guide to
Webasto
Thermo Top C300
Motorhome Diesel
Hot Water & Heating
Phone: 01302 322232
Fax: 01302 322231
White Rose Way
Doncaster Carr
Doncaster
South Yorkshire
Webasto Product UK Ltd
STARTUP
The Instant Hot Water and Heating System is activated
by means of the switch on the control panel. A green
light will illuminate, indicating that the water heater has
begun operation. The heater start-up phase can last 2 to
3 minutes and comprises of the ventilation of the heater,
the burner ignition and the control of the flame
To obtain fresh hot water whilst also heating the
interior of the motor home,
Select the speed on the fan heater switches to give the
required volume of hot air to be delivered by the fan
heaters (the fan heaters are regulated by the room ther-
mostat)
After approximately 5 minutes (after combustion has
been established) the plate heat exchanger should de-
liver hot water almost straight away. The safety thermo-
static mixing valve limits the water temperature to ap-
proximately 48°C. (this threshold can be regulated be-
tween 30 and 48°C)
The heating system utilises the vehicle’s own diesel fuel
supply. The heater’s “intelligent” operating system al-
lows it to be much more economical when in constant
heating use by adjusting its heat output accordingly be-
tween 2.5-5.2kW output. With both fan heaters on high
speed the system will draw approximately 4 to 5 Amps,
so if you are not connected to a mains electricity supply,
it is advisable to start the engine of the motor home at
least once a day, for approximately 15 to 30 minutes in
order to recharge the batteries
External temperatures of - 20 °C and below can result in
a temporary loss of vehicle battery capacity from 25 to
50%, therefore good maintenance of the vehicle’s bat-
teries is essential, ideally supported by using the charg-
ing system of the Motor Home
The heating circuit must always be protected by anti-
freeze with a corrosion inhibitor, and for extreme winter
conditions a winter grade fuel is recommended. When-
ever the motor home is not in use the fresh water circuit
must be drained
Summer Mode
In warmer conditions, when you do not require any heating
but only hot water, leave the blowers turned off & fresh hot
water will be produced much faster. Also the current draw
of the heating system will be much less.
The system only needs to be switched on for the period of
hot water requirement. Switch the system off when not re-
quired.
SHUT DOWN
When the heater is switched off by means of the switch on
the control panel the green light will extinguish and the
heater will begin its shut down cycle. This phase includes
purging of the combustion chamber and will last approxi-
mately 2 – 3 minutes before the combustion air fan auto-
matically switches off The blowers will also switch off auto-
matically.
In Winter when the system is not in use. Drain the
fresh water system. There maybe an optional fresh
water drain tap under the plate heat exchanger.
The Webasto heater coolant circuit uses an Antifreeze
Mixture. Use the same ratio as recommended by the
vehicle manufacturer.
For further information refer to the product installa-
tion/operation handbook.
Rated Heat Output
Full Heat
Reduced Heat
kW
5.2
2.6
Fuel Consumption
Full Heat
Reduced Heat
Ltrs/hr
0.59
0.29
Heater Electrical
Input
(Not including blower)
Full Heat
Reduced Heat
W
46
36
Weight of Heater
kg
2.9
Part No 41S85053A Issue 1 15.9.06
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