ATMOS DC25GSP wood and pellet boiler – efficient combination boiler with 25 kW
The ATMOS DC25GSP is a modern combination boiler for burning firewood and wood pellets. The boiler combines the efficiency of a wood gasification boiler with the convenience of an automatic pellet burner. This allows flexible switching between manual wood operation and automatic pellet operation.
With a wood output of 25 kW the boiler is particularly suitable for single-family homes and larger residential buildings. The combination of wood gasification and pellet technology enables reliable and economical heat supply.
Highlights and benefits
- ⭐ Combination boiler for firewood and wood pellets in one heating system
- ⭐ Heating output up to 25 kW for single-family homes and larger buildings
- ⭐ Automatic pellet burner start possible after wood burn-out
- ⭐ High efficiency of over 92 % for efficient operation
- ⭐ Boiler class 5 according to EN 303-5 for modern biomass heating systems
Areas of application & target group
The ATMOS DC25GSP is suitable for various heating systems in residential areas and is frequently used for:
- Single-family homes
- Two-family homes
- Renovation of existing heating systems
- New buildings with biomass heating
- Heating systems with buffer storage
Thanks to the combination of wood and pellet operation, the boiler can be used flexibly. Firewood is added manually, while pellets can be fed automatically.
Everyday benefits
The combination boiler allows convenient use of two fuels. When heating with wood, the boiler operates as an efficient wood gasification boiler. Once the wood has burned out, the pellet burner can start automatically and continue heating operation.
This keeps the heating system running reliably even when no wood is added. This increases comfort and reduces manual effort when heating.
Technology & equipment
The ATMOS DC25GSP has a robust steel construction with a ceramic combustion chamber. Combustion is controlled via several thermostats and control components.
- Boiler thermostat for output control
- Flue gas thermostat for controlling the induced draft fan
- Safety thermostat (STB) against overheating
- Servo flap for automatic air control
- Slot for electronic heating control
Air supply and combustion are automatically adjusted to the fuel used, ensuring stable and efficient operation.
Efficiency & environment
The ATMOS DC25GSP achieves an efficiency of about 92.5 %in wood operation. In pellet operation, the efficiency is around 92.8 %. This ensures particularly efficient use of the fuel.
The boiler meets the requirements of boiler class 5 according to EN 303-5 and complies with modern emission standards for biomass heating systems.
Compatibility & system integration
The combination boiler is usually installed together with a buffer storage tank. This allows the generated heat to be stored efficiently and distributed evenly throughout the building.
The ATMOS DC25GSP can be integrated into various heating systems:
- Buffer tank
- Radiator heating systems
- Underfloor heating systems
- Domestic hot water preparation
Technical data
| Manufacturer |
ATMOS |
| Model |
DC25GSP |
| Product type |
Wood and pellet combination boiler |
| Wood output |
25 kW |
| Pellet output |
6 – 20 kW |
| Boiler efficiency wood |
92.5 % |
| Boiler efficiency pellet |
92.8 % |
| Energy efficiency class |
A+ |
| Boiler class |
5 according to EN 303-5 |
| Heating surface |
4.1 m² |
| Fuel hopper volume |
120 dm³ |
| Max. working pressure water |
250 kPa |
| Boiler weight |
659 kg |
| Flue gas connection |
150 / 152 mm |
| Electrical connection |
230 V / 50 Hz |
| Protection class |
IP20 |
| Required return temperature |
65 °C |
| Operating temperature |
80 – 90 °C |
Accessories & system recommendation
For efficient and safe operation, we recommend combining the boiler with suitable system components such as buffer tank, return temperature control, and safety groups.
Suitable system components
Installation and safety instructions
Installation may only be carried out by a qualified heating contractor. The national regulations as well as the manufacturer's installation and operating instructions must be observed.
FAQ
Can the ATMOS DC25GSP burn wood and pellets?
Yes, the combination boiler is designed for log wood and wood pellets and can switch between the two fuels.
What is the heating output?
In wood operation, the output is 25 kW. In pellet operation, the output range is between 6 and 20 kW.
Is a buffer tank necessary?
For efficient operation, a buffer tank is recommended.
Which fuels are approved?
Dry log wood with a residual moisture content of about 12–20 % and wood pellets with a diameter of 6–8 mm are used.
Does the pellet burner start automatically?
The pellet burner can start automatically as soon as the loaded wood has burned out and heat is still required.
What power supply does the boiler need?
The combination boiler requires a mains voltage of 230 V at 50 Hz.
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👉 Order commissioning now!
With the “Commissioning by ATMOS” service, you ensure that your boiler is optimally set up and meets all technical requirements.
For more information on the process, requirements, and services, see our article on [ATMOS commissioning].
