ATMOS P21 pellet boiler
compact, low-maintenance and easy-to-operate pellet heating system
Note on funding!
The Atmos P series is eligible for funding from 25 kW without a particle separator. The lower-output boilers only meet the requirements with a particle separator.
For this reason, we only offer the eligible variants online.
If you prefer the variant without a particle separator for the 14-21 kW boilers, or additionally the particle separator for the P25 variant, please contact us and we will create an individual offer for you.
Request an offer
Atmos P pellet boiler
The boilers of the ATMOS Ppellet boiler Series – the P14, P21 and P25 stand out as an automatic, compact, and low-maintenance, user-friendlypellet heating system that covers the heat demand of single-family and multi-family houses with a nominal heat output of between 14 – 24 kW for 6-8 mm wood pellets. The boilers of the ATMOS P-Series are pure pellet boilers, which are operated autonomously or often in combination with a separate wood boiler. Depending on the installation situation, the burner can be mounted on the left or right side of the pellet boiler . This in turn offers the advantage that it is not in the way during cleaning and all surfaces are easily accessible to the user after opening the large boiler door. The pellet feed, as with our other pellet boiler series, is carried out by means of a screw conveyor from a separate ATMOS silo, textile storage, or on-site storage room. Depending on the application, we offer the screw conveyors in lengths of 1.5 – 2.0 – 2.5 – 3.0 and 4.0 m. Since reliability of its pellet boilers is a top priority for ATMOS, the screw conveyors are only designed as a straight-line system!
Equipment & Features
- features a large combustion chamber
- pellet boiler made of high-quality 6 mm boiler steel
- Pellet burner can be mounted on the right or left as needed
- the P series offers a very compact, space-saving design
- easily accessible flue gas heat exchanger
- very user-friendly and quick boiler cleaning
- the P series can be extended with automatic ash removal
- equipped with the ATMOS A25 or A45 pellet burner
- low power consumption
- can be combined with ATMOS wood gasification boilers
- very high efficiency > 90% and excellent emission values
- the ATMOS P Pellet boiler are BAFA-eligible for funding
- unbeatable price-performance ratio
Technical data
- Energy efficiency class A+
- Boiler class 3
- Nominal heat output 21 kW
- Efficiency 90.3%
- Draft requirement 18 Pa
- CO content 131 mg/m³
- Dust emission 9 mg/m³
- Required fuel Pellets
- Flue gas temperature 147 °C
- Flue gas mass flow 0.015 kg/s
- Height 1207 mm
- Width 620 mm
- Depth 770 mm
- Flue pipe connection 150/152 mm
- Flue pipe outlet 807 mm
- Weight 386.0 kg
Scope of delivery
- Atmos P21 pellet boiler
- Installation and operating instructions
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👉 Order commissioning now as well!
With the "Commissioning by ATMOS" service, you ensure that your boiler is optimally set up and meets all technical requirements.
You can find more information about the process, requirements, and services in our article on [ATMOS commissioning].