Introduction
This manual provides essential instructions for the safe and efficient installation, operation, and maintenance of your Sannover SLS 18 kW Wood Boiler. Please read this manual thoroughly before attempting any installation or operation. Retain this manual for future reference.
Important Safety Information:
- Installation, electrical connection, functional verification, maintenance, and any repairs must be performed by a qualified professional.
- Annual maintenance by a qualified professional is mandatory to ensure safe operation and warranty validity.
- Failure to comply with these conditions will void the manufacturer's warranty.
- Upon delivery, it is imperative to inspect the package thoroughly, both externally and internally, for any damage. Without a documented claim at the time of delivery, no product exchange or refund will be possible for transit damage.
Setup and Installation
The Sannover SLS 18 kW Wood Boiler requires professional installation to ensure proper function, safety, and warranty compliance. Do not attempt self-installation.

Image: The Sannover SLS 18 kW Wood Boiler, featuring an orange and black steel body, installed in a utility room. A flue pipe extends from the top, and various tools and stacked firewood are visible nearby.
Product Dimensions and Weight:
- Dimensions (L x W x H): 116 x 54.5 x 132.5 cm
- Weight: 405 kg
- Material: Steel
- Color: Black (with orange casing)
Ensure the installation area can support the boiler's weight and dimensions, and that adequate ventilation and clearances are maintained as per local building codes and professional installer recommendations.
Operating Instructions
This wood boiler is designed for efficient heating using solid wood fuel.
Fuel Requirements:
- Fuel Type: Wood
- Maximum Log Length: 50 cm
Use only dry, seasoned wood to ensure optimal combustion efficiency and to minimize creosote buildup. Avoid using treated wood, trash, or other unsuitable materials.
Power Output:
The boiler provides a nominal heat output of 18 kW.
Refer to the professional installer for specific operating procedures, including initial firing, loading fuel, and temperature control settings, as these may vary based on your specific heating system configuration.
Maintenance
Regular maintenance is crucial for the longevity, efficiency, and safe operation of your Sannover SLS 18 kW Wood Boiler. An annual maintenance check by a qualified professional is mandatory.
Recommended Maintenance Tasks (by a professional):
- Flue pipe and chimney cleaning.
- Inspection and cleaning of the combustion chamber and heat exchangers.
- Checking and adjusting safety devices.
- Verification of system pressure and water quality.
- General inspection for wear and tear on components.
User Maintenance: Regularly remove ash from the ash pan. Ensure the boiler area is kept clean and free of combustible materials.
Troubleshooting
If you experience issues with your Sannover SLS 18 kW Wood Boiler, consult your qualified installer or a service professional. Do not attempt repairs yourself, as this can be dangerous and may void your warranty.
Common Issues (Professional Assistance Required):
- Insufficient heating.
- Excessive smoke or poor combustion.
- Water leaks.
- Unusual noises during operation.
- Control panel errors or malfunctions.
Always prioritize safety. If you suspect a gas leak or fire hazard, immediately shut down the boiler (if safe to do so), evacuate the area, and contact emergency services and a qualified technician.
Specifications
| Feature | Detail |
|---|---|
| Brand | Sannover |
| Model Number | SLS18 |
| Power Output | 18 kW |
| Fuel Type | Wood |
| Max Log Length | 50 cm |
| Material | Steel |
| Color | Black (with orange casing) |
| Product Dimensions (L x W x H) | 116 x 54.5 x 132.5 cm |
| Product Weight | 405 kg |
| Country of Origin | Turkey |
Warranty and Support
Manufacturer's Warranty: The Sannover SLS 18 kW Wood Boiler comes with a 2-year parts warranty from the manufacturer. This warranty is strictly conditional upon all installation, electrical connection, functional verification, maintenance, and repair operations being carried out by a qualified professional. Annual maintenance is mandatory to maintain warranty validity.
Spare Parts Availability: Information regarding spare parts availability is currently unavailable. Please contact your seller or a qualified service professional for assistance with parts.
For technical support, warranty claims, or service inquiries, please contact your original point of purchase or a certified Sannover service provider.





