ATMOS DC40GSP 39 kW Wood and Pellet Combination Boiler

2026-03-13T12:26:56+01:00

Vendor: Atmos
Type: Combi boiler
Price: 12047.00

ATMOS DC40GSP Wood and Pellet Boiler – High-Performance Combination Boiler with 39 kW

The ATMOS DC40GSP is a high-performance combination boiler for burning firewood and wood pellets. The unit combines efficient wood gasification 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 39 kW, this biomass boiler is particularly suitable for larger single-family homes, multi-family houses, and buildings with higher heat demand. The combination of wood and pellet operation enables reliable and comfortable heat supply.

Highlights and Benefits

⭐ Combination boiler for firewood and wood pellets in one heating system

⭐ Heating output up to 39 kW for buildings with high heat demand

⭐ Automatic pellet operation possible after the wood has burned out

⭐ Efficiency of over 92 % for efficient fuel utilization

⭐ Boiler class 5 according to EN 303-5 for modern biomass heating systems

Application Area & Target Audience

The ATMOS DC40GSP is particularly suitable for larger buildings and systems with higher heat demand.

larger single-family homes

multi-family houses

agricultural buildings

workshops and commercial properties

Heating systems with buffer storage

By combining firewood and pellets, this heating boiler offers high flexibility. Wood can be added manually, while pellets are fed automatically.

Benefits in Everyday Use

The combination boiler enables the convenient use of two fuels. When heating with wood, the boiler operates as a high-performance wood gasification boiler. Once the wood has completely burned out, the pellet burner can start automatically and continue the heating operation.

This ensures the heat supply remains reliable even when no wood is added. This reduces the operational effort in daily heating operation.

Technology & Features

The ATMOS DC40GSP features a robust steel construction with a ceramic combustion chamber. Multiple thermostats and control components ensure safe and efficient operation.

Boiler thermostat for output regulation

Flue gas thermostat for controlling the induced draft fan

Safety thermostat (STB) for protection against overheating

Servo flap for automatic air regulation

Preparation for electronic heating control

The air supply and combustion are automatically adjusted to the respective fuel, enabling stable and efficient operation.

Efficiency & Environment

The combination boiler achieves an efficiency of approximately 92 % in wood operation. In pellet operation, the efficiency is around 92.8 %. This results in particularly efficient utilization of the fuel used.

The ATMOS DC40GSP meets the requirements of boiler class 5 according to EN 303-5 and complies with modern emission standards for biomass heating systems. :contentReference[oaicite:1]{index=1}

Compatibility & System Integration

For efficient operation, the combination boiler is typically installed with a buffer storage tank. This allows the generated heat to be stored and distributed evenly within the heating system.

The ATMOS DC40GSP can be integrated into various heating systems:

Buffer storage

Radiator heating systems

Underfloor heating systems

Domestic hot water preparation

Technical Data

Manufacturer | ATMOS
Model | DC40GSP
Product Type | Wood and Pellet Combination Boiler
Wood Output | 39 kW
Pellet Output | 8 – 24 kW
Boiler Efficiency Wood | 92 %
Boiler Efficiency Pellet | 92.8 %
Energy Efficiency Class | A+
Boiler Class | 5 according to EN 303-5
Heating Surface Area | 4.9 m²
Fuel Chamber Volume | 150 dm³
Max. Working Pressure Water | 250 kPa
Boiler Weight | 745 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 Recommendations

For safe and efficient operation, combination with suitable system components such as buffer storage, return temperature elevation, and safety groups is recommended.

Suitable System Components

Buffer storage

Return temperature elevation

Safety groups

Pellet burner

Heating controls

Installation & Safety Instructions

The installation of the heating boiler must only be carried out by a qualified heating contractor. The applicable regulations as well as the manufacturer's installation and operating instructions must be observed.

FAQ

Can the ATMOS DC40GSP burn wood and pellets?

Yes, the combination boiler is designed for firewood and wood pellets and enables flexible operation with both fuels.

What is the heating output?

The output in wood operation is 39 kW. In pellet operation, the output range is between 8 and 24 kW.

Is a buffer storage tank necessary?

For efficient operation, a buffer storage tank is recommended.

Which fuels may be used?

Dry firewood with a residual moisture content of approximately 12–20% and wood pellets with a diameter of 6–8 mm may be used.

Does the pellet burner start automatically?

The pellet burner can start automatically once the loaded wood has burned out and heat is still required.

What power supply does the boiler require?

The combination boiler requires a mains voltage of 230 V at 50 Hz.

Download

Operating Instructions

Supplement to Operating Instructions

Exploded View Drawing

Combination Boiler Brochure

Pellets Declaration of Conformity

👉 Order Commissioning Service Now!
With the "Commissioning by ATMOS" service, you ensure your boiler is optimally set up and all technical requirements are met.

Further information on the process, requirements, and services can be found in our article on [ATMOS Commissioning].