SOLIMAX 20 Wood and Coal Boiler, 23 kW Power

SOLIMAX 20 Wood and Coal Boiler, 23 kW Power. Efficient Heating for Swimming Pools, Gardens and Homes

 

Looking for an efficient, durable, and reliable way to heat your pool or garden facilities? The SOLIMAX 20 wood boiler is a cast-iron boiler designed to work with firewood — and also coal — offering great power, savings, and dependability. With its large combustion chamber, double front door for loading and cleaning, and water-cooled system, this boiler is a solid choice to keep your outdoor spaces warm and comfortable during the colder months.

 

Essential Uses

Heating water for garden installations – Perfect for feeding heating circuits that warm pool houses, technical rooms, or outdoor zones connected to your pool or spa.

Home or annex heating – If you have a house or annex near the garden, this boiler can integrate into your central heating system using solid fuels.

Supplemental pool water heating – During the off-season, use it to raise or maintain the pool’s water temperature.

Heating auxiliary spaces – Ideal for heating pool-side changing rooms or garden outbuildings.

Mixed fuel flexibility – Designed for both wood and coal, giving you flexibility depending on fuel availability and cost.

 

Advantages and Benefits

• High thermal efficiency – Its dual horizontal flue gas path and cast-iron body ensure excellent heat transfer and fuel performance.

• Robust and long-lasting build – Made of high-quality cast iron (GJL-200) with steel fittings, resistant to corrosion and designed for decades of service.

• Large loading door and easy maintenance – The wide 320 × 315 mm loading opening allows large logs and simplifies cleaning operations.

• Water-cooled grates – Especially useful when burning coal, preventing overheating and extending the life of internal components.

• Fuel versatility – Operates with both firewood and coal, giving you flexibility throughout the year.

• Compatible with forced or natural circulation systems – Easily integrates with a wide range of heating and water circulation installations.

 

Technical Features

• Nominal output (wood): 23 kW

• Nominal output (coal): 27 kW

• Body material: Cast iron

• Loading door size: 320 × 315 mm

• Flue outlet diameter: Ø 175 mm

• Max working pressure: 4 bar

• Water capacity: Approx. 29 L (model 20)

• Efficiency: Around 75 % with wood

• Approved fuels: Wood (max 20 % humidity) and coal (max 15 % humidity)

 

Recommendations

• Install in a well-ventilated boiler room that complies with local safety codes.

• Always use dry wood (under 20 % moisture) for better combustion and less soot.

• Perform regular maintenance: clean combustion chambers, remove soot, and check doors and gaskets for sealing.

• Ensure the chimney has sufficient draft and is properly dimensioned to prevent smoke backflow.

• Consider adding a buffer tank (thermal store) to stabilize temperature peaks and extend the boiler’s lifespan.

 

Frequently Asked Questions

Can I use both wood and coal?Yes — the SOLIMAX 20 supports both. Output is approx. 23 kW with wood and 27 kW with coal.

What log size can I load?It accommodates logs up to 320 mm long × 315 mm wide, making it convenient for larger wood pieces.

What is its efficiency?The boiler reaches 75–77 % efficiency under optimal burning conditions.

Can it integrate with an existing heating system?Absolutely. It’s compatible with both forced and natural water circulation systems — just follow the installation guidelines.

What kind of maintenance does it require?Regular cleaning (soot removal, door and seal checks), monitoring pressure levels, and keeping the flue and chimney clean are recommended.

 

If you need more information, please do not hesitate to contact us: Contact