Unit Heater S-3S series 230V – model S3-3S / WHS3-3S-1791 is a high-efficiency industrial water fan heater designed for heating large manufacturing halls, warehouses, workshops, and logistics centers.
The unit features a 3-row heat exchanger providing maximum heat output and efficiency.
Its galvanized steel housing with powder coating ensures excellent corrosion resistance, while the IP54-rated fan fully complies with the ErP 2015 Directive for energy efficiency and safety.
Thanks to its three fan speeds and wide heating range, the device guarantees optimal comfort and precise climate control in demanding environments.
Advantages
- Galvanized steel housing with durable powder coating
- 3-row heat exchanger – high thermal output for large areas
- 3-speed fan (IP54) compliant with ErP 2015
- Quiet, efficient, and reliable performance
- Easy to install and maintain
- Compatible with automatic HC controllers
- Designed for water temperatures up to 120 °C
- 24-month warranty
Applications
Perfect for heating of:
- Production and storage halls
- Logistics centers and commercial pavilions
- Car repair shops and garages
- Sports and public facilities
- Large industrial buildings
Technical Specifications
| Parameter | Unit Heater S3-3S / WHS3-3S-1791 |
|---|---|
| Product code | WHS3-3S-1791 |
| Nominal heating capacity [kW]* | 36.9 / 20.8 / 17.8 |
| Heating capacity range [kW] | 2.92 – 48.8 |
| Maximum airflow [m³/h] | 1800 / 850 / 700 |
| Maximum isothermal range [m] | 11 |
| Number of heat-exchanger rows | 3 |
| Water capacity [dm³] | 1.9 |
| Max fluid temperature [°C] | 120 |
| Max fluid pressure [MPa] | 1.6 |
| Connection diameter [inch] | 3/4 |
| Power supply [V/Hz] | 230 / 50 |
| Nominal motor current [A] | 0.58 / 0.34 / 0.30 |
| Motor speed [rpm] | 1400 / 1100 / 850 |
| Motor power [W] | 124 / 85 / 75 |
| Motor protection class | IP54 |
| Net weight [kg] | 20 |
| Noise level [dB] | 53 / 47 / 45 |
* Parameters based on 90/70 °C water and 0 °C inlet air.
Conclusion
S3-3S / WHS3-3S-1791 is the ideal choice for heating large-scale industrial and commercial buildings.
Its powerful 3-row heat exchanger, robust steel body, and quiet operation ensure efficient, long-lasting performance in demanding professional conditions.















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