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Combi 4 E

Combination heater with integrated heating elements

Combi 4 E combines all the benefits of Combi 4 with those of an electric heater. As opposed to Combi 4, it also has integrated heating elements. This allows you to run the heater at camp sites with the 12V power supply unit without the vehicle battery. Combi 4 E uses very little electricity.

With integrated heating rods for additional electric operation
Heats the vehicle and heats the water particularly quickly
Consumes little energy

Technical Details

Energy sources
Propane / butane + electricity
Operating pressure
30 mbar
Rated heat output in gas mode
2000 W / 4000 W
Rated heat output in electric mode
900 W / 1800 W
Rated heat output in mixed mode
max. 3800 W
Fuel consumption
160 – 335 g/h
Power consumption (at 12 V): operation of heater and water container
max. 6.5 A for short periods (average approx. 1.2 A)
Power consumption (at 230 V)
3.9 A / 7.8 A
Water capacity
10 litres
Heating time (from approx. 15 °C to approx. 60 °C): Water container
approx. 23 min.
Heating time (from approx. 15 °C to approx. 60 °C): Heater and water container acc. to EN 15033
approx. 15.5 kg
Dimensions (L x W x H)
510 x 450 x 300 mm
Installation dimensions (min.imum dimensions–additional space must be provided for the gas connection. water connections and drain valve (L x W x H) depending on the installation situation)
540 x 500 x 350 mm
Power consumption (at 12 V): heating water container
max. 0.4 A
Air flow rate (free blowing) with 4 warm air outlets
max. 287 m³/h
Quiescent current
approx. 1 mA
Quiescent current consumption CP plus (optional)
3 mA
FrostControl heating element (optional)
max. 0.4 A
Pump pressure
max. 2.8 bar
System pressure
max. 4.5 bar


More details about Combi 4 E

Combi 4 E combines all the benefits of Combi 4 with those of an electric heater. As opposed to Combi 4, it also has integrated heating elements. This allows you to run the heater at camp sites with the 12V power supply unit without the vehicle battery. Combi 4 E uses very little electricity. The heater runs in gas mode for self-sufficient use, in electrical mode at the camp site and in mixed mode when outside temperatures are low. In summer, Combi 4 E heats just the water without running the space heater.

Like all Combi models, Combi 4 E also combines space and water heating in one appliance. The heater provides comfortable warmth in your vehicle in just a few minutes. It also heats the water that you need for showering, washing dishes or washing your hands. And the best thing about it: you only have to install one appliance in your caravan or motor home. This saves space and weight: as opposed to an S heater, there are no obstacles that you have to walk around in your vehicle.

  • Digital CP plus iNet ready control panel: automatic climate control in combination with a Truma air conditioner
  • FrostControl automatically empties the water tank in cold weather

Further Highlights:

  • With integrated heating elements for additional electrical mode
  • Heats the vehicle and water very quickly
  • Uses little energy
  • Many installation options as it is extremely lightweight and compact
  • The warm air from Combi 4 E is distributed optimally via four air outlets
  • Gas, electrical and mixed modes are possible

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  • How does the Truma Combi heater work?

    The heater is started and the desired temperature for heating and hot water is set on the Truma Combi LCD control panel (1). The heater is connected to the gas supply of the vehicle via the gas connection (2). The gas supply to the heater is controlled via the solenoid valve (3). The required combustion air enters the appliance through the outer duct of the combined combustion air/exhaust cowl (4) and is fed to the gas burner (6) with the help of the combustion air fan (5). The gas burner, which has two ignition electrodes (7) and a flame rectification electrode, ignites the gas-air mixture in the combustion chamber (8).

    The hot exhaust gases are diverted at the end of the combustion chamber on the baffle of the flame tube (9) and flow back between the flame tube of the burner and the inside wall of the heat exchanger. They are fed to the atmosphere via the exhaust cowl (4).

    The circulation fan (10) blows the air that is to be heated into the appliance. There, the air flows along the fins of the heat exchanger (11) which ensures optimum heat transfer because of its large transfer surface area. Inside the heat exchanger are additional 1800 W electric heating elements (12). They can be used to heat water and/or warm air alternatively or additionally. The warm air is then distributed in the vehicle via four warm air outlets (13).

    Fresh water is in the outer stainless steel water container, which holds up to ten litres (14). It is heated by the heat transfer from the heat exchanger (11). Because of the eccentric shape of the water container, the warm water circulates, which ensures optimum mixing of the water and better thermal stratification. The warm water connection pipe (15) connects the Truma Combi with the hot water lines in the kitchen and bathroom. Cold water is pumped from the freshwater tank via the cold water connection pipe (16).

    The room temperature sensor in the vehicle (17) measures the air temperature in the vehicle. The water temperature is also measured by internal temperature sensors. The appliance reduces the heat output before the desired heating and water temperatures are reached. When the set temperature is reached, the burner switches off. When the temperature falls below the set heater and water temperatures, the Truma Combi switches on again automatically to heat air and water (winter mode). In summer mode it is possible to heat up the water independently of the space heater. The HDF thermal jacket (18) provides good insulation for the Truma Combi heater.

  • In summer, can the Truma Combi heater heat just water without heating the living area?


    Simply set the switch to summer mode and select 40 or 60 degrees Celsius water temperature. When the yellow LED on the control panel goes out, the respective water temperature is reached. The heating system heats only water and the circulation fan does not run. Output in summer mode is 2 KW.

  • Can Truma heaters also be operated while I’m driving?

    Yes, heating while driving is possible with Truma Combi and VarioHeat heaters.

    With Truma S and Trumatic S heaters, operating the heater while driving is possible only with a cowl top, which must be installed freely in the air flow. Truma recommends the cowl tops T-3 or T-2. Otherwise the flame can blow back and cause damage to the heater.

    The cowl top must protrude at least 10 cm above roof attachments, such as roof boxes, ski or luggage racks so that the heater works properly.

    For heating while driving, Directive UN ECE R 122 for motor homes and caravans specifies a safety shut-off device. The Truma MonoControl CS gas pressure regulation system fulfils this requirement. Throughout Europe, a type-tested LPG heater may be used while driving (according to Directive UN ECE R 122) if the system includes this regulator with an appropriately configured gas installation. National regulations must be observed.