Thermo plus

The shorter the heater the better

Thermo plus heater is the latest result from almost 40 years of development, production and sales. It is significantly shorter and lighter than its predecessors, and has an extended service life while producing less starting noise and exhaust emissions.

Applicable in diesel buses and best additional fuel-burning heater solution for electrically powered buses to extend vehicle range.

Released for selected alternative fuels according to DIN EN 15940.


Low life-cycle costs

  • Less fuel consumption due to reduced short burning times (30% over a heating period)
  • Brushless EC motor enables extended running times
  • Maintenance-friendly

Environmentally friendly

  • Lower internal consumption of the heater over a heating period
  • Reduced exhaust emissions when starting
  • Less starting noises
  • Emissions are well below current standards
  • Suitable for operation with alternative fuels according to DIN EN 15940


  • Engine-independent heater operation
  • 3 performance classes from 23 to 35 kW
  • External control of the circulation pump

Technical data

  Thermo plus 230 Thermo plus 300 Thermo plus 350
Heat output (kW) 23 30 35
Power consumption (W) 60 90 120
Fuel consumption (kg/h) 2.5 3.0 3.6
Rated voltage (V) 24 24 24
Dimensions (L x B x H in mm) 540 x 250 x 222 540 x 250 x 222 540 x 250 x 222
Weight (kg) 16 16 16