ATMOS AC 25 S
Code: AC25SProduct detailed description
The Atmos AC 25 S is designed for installation in industrial and residential heating systems where a reliable and efficient solid fuel boiler is required. It is commonly used in buildings with high thermal demands, including workshops, barns, and detached homes. The boiler is integrated into hydronic heating systems, where it provides consistent heat output through a closed-loop water circuit. Installers should consider the boiler’s combustion class, fuel type and flue requirements when planning the installation.
As a combustion-based system, the Atmos AC 25 S requires careful sizing to match the building’s heat loss and system flow rates. The boiler’s water content and fuel chamber capacity are key factors in determining its operational autonomy and efficiency. The system is compatible with standard heating circuits and requires a minimum return water temperature of 65 °C for optimal performance.
Technical parameters
| Electrical power consumption | 50 W |
|---|---|
| Water volume | 45 L |
| Alternative fuel | wood with max. length 330 mm |
| Boiler weight | 297 kg |
| Combustion quality - CO | <500 mg/m³ |
| Minimum return water temperature | 65 °C |
| Fuel chamber volume | 66 dm³ |
| Required chimney draft | 20 Pa |
| Supply voltage | 230/50 V/Hz |
| Combustion class | 5 |
| Output | 26 kW |
| Code | AC25S |
| Brand | Atmos |
The boiler’s 26 kW output and 45 L water content are critical for determining its suitability for different building sizes and thermal loads. The 66 dm³ fuel chamber allows for extended operation without frequent refuelling. The 50 W electrical power consumption is used to operate the exhaust fan and control systems. The 230 V supply voltage is standard for such installations, and the 20 Pa chimney draft requirement must be met to ensure proper flue gas removal.
Installation and connection
Installation of the Atmos AC 25 S requires a dedicated space with sufficient clearance for maintenance and fuel access. The boiler is connected to the heating system via standard pipe sizes, with flue gas exiting through a vertical chimney. The exhaust fan must be wired to a 230 V supply, and the chimney must provide a minimum 20 Pa draft. A return water temperature of at least 65 °C is required to prevent condensation and corrosion. Common installation errors include incorrect chimney sizing, poor fuel chamber access and inadequate ventilation.
Compatibility and accessories
The boiler is compatible with standard heating systems using water as the heat transfer medium. It can be integrated with radiators, underfloor heating or heat exchangers. No additional accessories are required for basic operation, but a chimney with the correct draft and a fuel storage area are essential. The boiler is designed for use with brown coal briquettes, black coal and wood, and no alternative fuel systems are recommended without manufacturer approval.
Technical background for designers
The Atmos AC 25 S operates on the principle of generator gasification, where primary and preheated secondary air support complete combustion. The boiler body is constructed from 3–6 mm thick steel plates, providing durability and heat retention. The patented rotating grate between the fuel chamber and combustion chamber ensures even fuel burning and efficient ash removal. The exhaust fan facilitates smoke-free ash removal, while the cooling loop prevents overheating. The boiler’s efficiency is influenced by fuel quality, combustion air supply and chimney performance. The combustion class 5 rating indicates compliance with EN 303-5 standards for solid fuel boilers.
Service and operation
Regular maintenance includes ash removal and chimney cleaning. For coal, ash should be removed daily; for wood, weekly. The cooling loop must remain operational to prevent overheating. The boiler’s automatic shutdown function activates when fuel is exhausted, protecting the system from damage. No scheduled service intervals are specified in the brief, but routine checks are recommended to ensure optimal performance.
Frequently asked questions
Can the Atmos AC 25 S be used with wood as the primary fuel?
Yes, the boiler can burn wood as an alternative fuel, provided the pieces are no longer than 330 mm. However, it is optimised for coal briquettes and black coal.
Is the exhaust fan essential for operation?
Yes, the exhaust fan is required for smoke-free ash removal and proper flue gas extraction. The boiler cannot operate without it.
What is the minimum chimney draft required?
The chimney must provide a minimum draft of 20 Pa to ensure safe and efficient operation of the boiler.
Can the boiler be integrated with a condensing system?
No, the boiler requires a minimum return water temperature of 65 °C and is not suitable for condensing systems.
Additional parameters
| Category: | For coal/wood/ |
|---|---|
| Warranty: | 2 years |
| Weight: | 341.55 kg |
| Boiler output: | 21 – 28 kW |
| Fuel: | wood |
| Alternative fuel: | wood with a max. length of 330 mm |
| Boiler weight: | 297 kg |
| Combustion class: | 5 |
| Combustion quality - CO: | <500 mg/m³ |
| Connection voltage: | 230/50 V/Hz |
| Electrical power input: | 50 W |
| Hopper volume: | 66 dm³ |
| Minimum return water temperature: | 65 °C |
| Output: | 26 kW |
| Prescribed chimney draught: | 20 Pa |
| Water volume: | 45 L |
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