2-in-1 Function

Thermal performance testing for solar air collector; Pressure drop test; Time constant test; Visual inspection; Internal pressuretest; Rupture or collapse test; Stagnation temperature; Exposure test; Externalthermal shock; Internal thermal shock; Rain penetration; Freeze resistance; Mechanical load; Impact resistance test using steel ball; Final inspection. All above listed tests of the standard EN12975-1:2006+A1:2010 and ISO 9806:2017 were passed successfully in accordance with the criteria.

Z Collecteur d'air OS22 Réchauffeur solaire：Aérotherme chauffage climatiseur Climatisation Déshumidificateur Pompe à Ventilation Déshumidification Oscar

The Solar Keymark is a voluntary third-party certification mark for solar thermal products, demonstrating to end-users that a product conforms to the relevant European standards and fulfills additional requirements. It is widely spread across the European market and beyond. The Solar Keymark is a quality label.

Standard Function

Air collector OS42 Solar air heater, air ventilator with LCD thermostat：heating air Conditioner Conditioning Exhaust Fan Ventilator Thermal Panel Dehumidifier Heat Pump Ventilation Dehumidification water Attic roof vent gable OSCAR

Nakoair OS42 Solar Air Heater & Ventilator – 2-in-1 with LCD Thermostat – Up to 100m²

€660.00 €899.00

44 In Stock

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Maximum Solar Heating Power – For Large Spaces Up to 100m²

The Nakoair OS42 is our largest and most powerful solar air heater. With 135 m³/h airflow and up to 25°C temperature boost, it's designed for large rooms, open-plan spaces, and commercial applications. The same 2-in-1 function as the OS22/32, scaled up for maximum impact.

🌟 Why Choose the OS42?

  • Maximum Heating Power: 135 m³/h airflow. Up to 25°C temperature boost. The most powerful model we make.
  • Large Space Capacity: Heats up to 70–100m² effectively. Perfect for large homes and commercial spaces.
  • Exceptional Energy Yield: 1,418 kWh/year – the highest in the Nakoair range. Outstanding payback.
  • 2-in-1 Function: Heats fresh outdoor air + circulates indoor air. Exclusive to OS22/32/42 series.
  • 72% Heating Efficiency: Advanced absorption board technology captures more solar energy.
  • LCD Smart Thermostat: 5 operating modes, real-time climate display, automatic energy switching.

🔄 2-in-1 Function

Mode 1 – Fresh Air Heating: Morning and afternoon – heats fresh outdoor air and blows it indoors.

Mode 2 – Indoor Circulation (Exclusive): Noon time – circulates and reheats indoor air. The most effective way to raise room temperature. Can be extended at noon in spring and autumn for even more ventilation.

🔧 Technical Specifications

Model OS42
Function 2-in-1: fresh air heating + indoor air circulation
Recommended room size 70–100 m²
Max air flow 135 m³/h
Temperature rise Approx. 25°C above outdoor temperature
Heating efficiency 72%
Annual heating delivered Approx. 1,418 kWh/year
Sun intensity performance 1,380W
Thermostat LCD digital thermostat, 5 modes
Solar panel power 28W
Fan SUNON 12V, 5.4W, double ball bearing
Noise level 45 dB
Product size 197 × 100 × 6 cm
Net weight 26 kg
Carton size 204 × 106 × 9 cm
Gross weight 34 kg
Certification EN12975, ISO9806, TÜV, Solar Keymark, CE
Warranty 10 years (panel), 2 years (parts)

🏠 Perfect For

  • Large living rooms & open-plan homes (70–100m²)
  • Commercial spaces (shops, small offices, studios)
  • Large workshops & garages
  • Warehouses & storage buildings
  • Anyone wanting maximum solar heating power

💰 Highest Energy Yield – Fastest Payback

The OS42 delivers an exceptional 1,418 kWh/year of free solar heating. For large spaces that would otherwise cost hundreds of euros per year to heat, the OS42 pays for itself in 2–3 years and delivers free heat for 15+ more years.

📦 What's In the Box

  • OS42 solar air heater main unit (large size: 197×100cm)
  • LCD digital thermostat
  • 5–12V USB voltage boost cable
  • 135mm hole saw
  • Air duct, automatic air outlets
  • Activated carbon filter
  • Mounting accessories & manual

❓ FAQ

Is the OS42 too big for a normal house?

The OS42 is designed for 70–100m². If your space is smaller, the OS32 (up to 60m²) or OS22 (up to 40m²) may be a better fit. However, if you have a large open-plan living area, the OS42 is the right choice.

Can I install two OS42 units?

Yes! For very large spaces or whole-home heating, many customers install multiple units facing different directions (e.g., southeast + southwest) to capture sunlight throughout the day.

Delivery – is the OS42 too heavy to handle?

The OS42 weighs 26kg (net) / 34kg (gross). It's manageable for two people. Free delivery to your door is included. If you have concerns about handling, please contact us – we can provide guidance or recommend a local installer.

✅ Certified & Trusted

TÜV Rheinland – full certification including thermal performance, freeze resistance, mechanical load, and impact resistance.

EN12975 & ISO9806 certified | Solar Keymark | CE marked

The OS42 meets the highest European quality standards for solar thermal products.

Price includes VAT and customs duties. Free EU delivery to your door.

Nakoair solar air heater plant

About Nakoair

Oscar Science & Technology Co., Ltd. is a professional manufacturer of solar air collectors / heaters and solar ventilators. Nakoair® solar air heaters with LCD thermostat provide a healthy, warm home and automatically manage indoor air — simple to operate, thoughtful air-management experts.

Certifications & testing

Our products are certified and tested to international standards, including ISO 9001:2015, TÜV NORD, European Solar Keymark (EN ISO 9806) and TÜV Rheinland test reports. Every unit is built to EN12975 and TÜV standards.

Quality first

With in-house development and testing labs, we rigorously test air volume, temperature difference, insulation, UV-resistance, climate-resistance and water-proofing across materials. That is how Nakoair® delivers consistently better quality.

Sustainable innovation

By adopting high-tech materials such as low-iron ultra-pure glass and special nano-insulation coatings, we are committed to sustainable development and continuous innovation.

Worldwide

Nakoair® solar air heaters are sold in many countries — the UK, Denmark, Germany, Czechia, Australia, New Zealand, Canada, the USA and more. Year after year, Nakoair® grows in popularity thanks to its high performance and competitive price.

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