Unless limit values are specified, technical data listed in the table feature a tolerance range of ± 10% at an ambient temperature of +20 °C, as is typical for heating units. All electrical components are designed for a nominal voltage of 12 V.
| Heating unit | Operation | Thermo Top C | Thermo Top C |
| Certification mark | | -S289 | -S292 |
| Design | | Water heating unit with evaporation burner |
| Heat flow | Full load / Part load | 5.0 kW / 2.5 kW |
| Fuel | | Diesel | Petrol |
| Fuel consumption | Full load / Part load | 0.50 l/h / 0.25 l/h |
| Rated voltage | | 12 V |
| Operating voltage range | | 10.5...15 V |
| Nominal power consumption without recirculation pump (without vehicle fan) | Full load / Part load | 32 W / 18 W |
| Permissible ambient temperature for heating unit: operation/storage | | -40 °C...+60 °C / -40 °C.. +120 °C |
| Permissible ambient temperature for dosing pump: operation | | -40 °C...+20 °C |
| Heating unit | Operation | Thermo Top C-D | Thermo Top C-B |
| Certification mark | | E1 | E1 |
| Design | | Water heating unit with evaporation burner |
| Heat flow | Full load / Part load | 5.2 kW / 2.5 kW |
| Fuel | | Diesel | Petrol |
| Fuel consumption | Full load / Part load | 0.61 l/h / 0.30 l/h | 0.70 l/h / 0.34 l/h |
| Rated voltage | | 12 V |
| Operating voltage range | | 10.5...15 V |
| Nominal power consumption without recirculation pump (without vehicle fan) | Full load / Part load | 28 W / 18 W |
| Permissible ambient temperature for heating unit: operation/storage | | -40 °C...+60 °C / -40 °C.. +120 °C |
| Permissible ambient temperature for dosing pump: operation | | -40 °C...+20 °C |
| Heating unit | Thermo Top C | Thermo Top C-D / C-B |
| Permissible excess operating pressure (heat conveyor) | 0.4...2.5 bar | 0.4...2.5 bar |
| Heat conveyor capacity | 0.15 l | 0.15 l |
| Minimum circuit capacity | 4.00 l | 4.00 l |
| Minimum flow rate for heating unit | 250 l/h | 250 l/h |
| CO 2 in exhaust (perm. operating range) | 7...13.0 % by vol. | 8 ...12.0 % by volume |
| Heating unit dimensions | Length 214 mm Width 106 mm Height 168 mm | Length 214 mm Width 106 mm Height 168 mm |
| Weight | 2.9 kg | 2.9 kg |
| Recirculation pump | 4847 |
| Flow rate against 0.10 bar | 900 l/h |
| Rated voltage | 12 V |
| Operating voltage range | 10.5...15 V |
| Nominal power consumption | 14 W |
| Recirculation pump dimensions | Length 95 mm Width 61 mm Height 61 mm |
| Weight | 0.3 kg |