| HV 031 | Heater without fan (fan mounting kit included) |
| HVL 031 | Heater with fan |
| Heating element | high performance cartridge |
| Temperature safety cut-out | to protect against overheating in case of fan failure, |
| | automatic reset |
| Heater body | die-cast aluminium (glass bead blasted) |
| Connection | 3-pole screw connector 2.5mm², clamping torque 0.8Nm max. |
| Connection casing | plastic according to UL94 V-0, black |
| Mounting | clip for 35mm DIN rail, EN 60715 |
| Fitting position | vertical airflow (air outlet up) |
| Operating/Storage temperature | -45 to +70°C (-49 to +158°F) |
| Operating/Storage humidity | max. 90% RH (non-condensing) |
| Protection type/Protection class | IP20 / I (earthed) |
| Approvals | |
| HVL 031 only: | |
| Axial fan, ball bearing | airflow see table |
| | service life 50,000h at 25°C (77°F) |
| Connection (axial fan) | 2-pole screw connector 2.5mm² (L2/N2) |