In response to requirements such as comfort, relaxation and eco-friendliness Spheros developed parking heaters (Thermo 230/300/350) which for decades have succeeded in providing optimum climate in the bus interior. The outstanding features of the proven Thermo series are light weight and small size (610 x 246 x 220 mm) - despite the choice of power levels. Moreover the field-tested heaters chalk up outstanding results in the categories of performance and power consumption. The integrated booster function, for example, raises the temperature by means of consumption-optimized motors. All appliances in the Thermo series also have an integral two-stage diagnostic system.
| Thermo 230 | Thermo 300 | Thermo 350 |
| 23 | 30 | 35 |
| 65 | 110 | 140 |
| 24 | 24 | 24 |