1. Introduction
This manual provides essential information for the safe and efficient installation, operation, and maintenance of your SAWO ARIES ROUND ARI3 Electric Sauna Heater. Please read this manual thoroughly before installation and use, and keep it for future reference.
Product Overview
The SAWO ARIES ROUND ARI3 is a high-quality electric sauna heater designed for both home and commercial use. Its vertical cylindrical shape ensures efficient heat distribution and steam generation. The heater features a durable stainless steel casing and an intuitive integrated control panel for ease of use.

Figure 1: SAWO ARIES ROUND ARI3 Electric Sauna Heater with sauna stones.
Safety Information
Always follow local electrical codes and safety regulations. Installation should be performed by a qualified electrician.
- Do not cover the heater or place any objects on it.
- Ensure proper ventilation in the sauna room.
- Keep children and pets away from the hot heater.
- Never use ceramic or artificial stones; only use genuine sauna stones.
- Disconnect power before any maintenance or service.
2. Setup and Installation
Unpacking and Inspection
Carefully unpack the sauna heater and inspect it for any signs of damage during transit. Report any damage to your supplier immediately.
Stone Placement
The ARI3 model can hold up to 60 kg of sauna stones (diameter 5-10 cm). Arrange the stones loosely around the heating elements to allow for proper air circulation. Do not pack stones too tightly. The heating elements are separated from the stones by a special stone spacer to prolong their lifespan.

Figure 2: Close-up view of the heater's base and integrated controls.
Electrical Connection
The SAWO ARIES ROUND ARI3 is a multi-voltage heater, supporting either 230V single-phase (fuse: 1x40A) or 400V 3-phase (fuse: 3x16A) installation. Ensure the electrical supply matches the heater's requirements. The connection cable must be type HO7RN-F or equivalent and is not included.
- Consult a qualified electrician for all electrical connections.
- Ensure the main power supply is disconnected before wiring.
- Refer to the wiring diagram provided with the heater for specific connections.
Placement and Safety Distances
The heater is a floor-standing model. Maintain minimum safety distances from walls and ceiling.
| Measurement | Distance |
|---|---|
| Minimum distance to ceiling | 1200 mm |
| Minimum distance to side walls | 100 mm |

Figure 3: Heater installed in a sauna, demonstrating vertical placement.
3. Operating Instructions
Integrated Control Panel
The SAWO ARIES ROUND ARI3 features a convenient built-in control panel with an intuitive interface. The illuminated rotary knobs allow for easy adjustment even in low light conditions. The timer and thermostat controls can be switched sides for user convenience.

Figure 4: Heater with an optional wooden guard ring, highlighting the integrated controls at the base.
Setting the Timer
The timer has an operating time of 1 to 4 hours and a preset time function of 1 to 8 hours.
- Turn the timer knob to select the desired operating duration.
- For a delayed start, use the preset time function to set when the heater should begin operation.
Adjusting Temperature
The thermostat automatically maintains the selected temperature.
- Turn the thermostat knob to set your desired sauna temperature.
- The heater will cycle on and off to maintain this temperature.
Generating Steam
You can generate steam by pouring water onto the hot sauna stones, not only from the top but also from the sides due to the heater's efficient cylindrical design. Use only clean water.
4. Maintenance
Cleaning
Ensure the heater is completely cool and disconnected from power before cleaning. Wipe the stainless steel casing with a damp cloth. Do not use abrasive cleaners or solvents.
Sauna Stone Replacement
Sauna stones should be inspected regularly and replaced when they start to crumble or lose their porous structure. This typically occurs every 1-2 years depending on usage. Replacing stones ensures efficient heating and proper steam generation.

Figure 5: Close-up view of the sauna stones within the heater's stainless steel grid.
5. Troubleshooting
If you encounter issues with your SAWO ARIES ROUND ARI3 heater, refer to the following common problems and solutions. For more complex issues, contact a qualified service technician.
| Problem | Possible Cause | Solution |
|---|---|---|
| Heater does not heat up | No power supply; tripped circuit breaker; faulty heating element; thermostat set too low. | Check power connection and circuit breaker. Ensure thermostat is set correctly. If elements are faulty, contact service. |
| Sauna not reaching desired temperature | Insufficient heating time; sauna room too large for heater; poor insulation; stones packed too tightly. | Allow more time for heating. Verify sauna room volume is within heater's capacity (8-13 m³). Rearrange stones for better airflow. |
| Excessive steam or water dripping | Too much water poured on stones; stones are too old/crumbling. | Pour less water. Replace old sauna stones. |
6. Technical Specifications
| Feature | Detail |
|---|---|
| Model | ARI3-90NB-P |
| Power Output | 9.0 kW |
| Dimensions (H x W) | 930 mm x 300 mm |
| Weight | 14 kg |
| Installation Type | Floor-standing |
| Max. Stone Capacity | 60 kg (stones Ø 5-10 cm) |
| Recommended Sauna Room Size | 8-13 m³ |
| Voltage Options | 230V 1-phase (1x40A fuse) or 400V 3-phase (3x16A fuse) |
| Material | Stainless Steel |
| Control Panel | Integrated, illuminated timer (1-4h operation, 1-8h preset) and thermostat |
7. Warranty and Support
Warranty Information
The SAWO ARIES ROUND ARI3 heater comes with a manufacturer's warranty:
- For Home Use: 2 years for the heater.
- For Commercial Use: 1 year for the heater.
Please retain your proof of purchase for warranty claims. The warranty does not cover sauna stones or silicone connection cables, as these are not included with the heater.
Customer Support
For technical assistance, spare parts, or warranty inquiries, please contact your local SAWO distributor or the point of purchase.
Manufacturer: Sawo
Model Number: ARI3-90NB-P





