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 OS20 Solar air Heater heating air Conditioner Conditioning Exhaust Fan Ventilator Thermal Panel Dehumidifier Heat Pump Ventilation Dehumidificatio

Nakoair OS20 Solar Air Heater – Mechanical Thermostat – For Rooms up to 30m²

€320.00

36 In Stock

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Free Solar Heating for Medium Rooms – No Heating Bills

The Nakoair OS20 Solar Air Heater is our best-selling model for rooms up to 30m². Perfect for living rooms, bedrooms, holiday homes, and workshops. Heat your home with abundant, free solar energy.

🌟 Why Choose the OS20?

  • Free Heating All Sunny Days: Reduces or eliminates heating costs from spring through winter.
  • Mechanical Thermostat: Automatically stops the fan when your set temperature is reached – no overheating.
  • Fresh Air Daily: Replaces stale indoor air with warm, oxygen-rich outdoor air. Eliminates odors, formaldehyde, and allergens.
  • Mold Prevention: Continuous ventilation keeps humidity at the optimal 40–70% level. Protects wooden furniture and building structure.
  • DIY Installation: Install in 1 hour. Hole saw and all accessories included. No electrician needed.
  • Ultra-Long Lifespan: PV panel lasts 20 years. Double ball fan rated for 70,000 hours.

🔧 Technical Specifications

Model OS20
Recommended room size Up to 30 m²
Max air flow 88 m³/h
Temperature rise Approx. 10°C above outdoor temperature
Annual heating delivered Approx. 525 kWh/year
Thermostat Mechanical thermostat
Solar panel power 18W
Fan SUNON 12V, 3.4W, double ball bearing
Glass Low-iron solar tempered glass, 92% light transmittance
Product size See product images
Net weight See product images
Certification EN12975, ISO9806, TÜV, Solar Keymark, CE
Warranty 10 years (panel), 2 years (parts)

🏠 Perfect For

  • Living rooms & bedrooms (up to 30m²)
  • Holiday homes & cabins
  • Workshops & garages
  • Basements (mold & moisture control)
  • Summer houses & cottages

💰 Return on Investment

Estimated annual energy supplement: 525 kWh. Most customers recover the cost within 2–3 years. After payback, enjoy 15+ years of free heating. Compare this to electric heaters that cost hundreds per year to run.

🌱 Also Available: OS20LCD (LCD Thermostat Version)

Prefer digital temperature control? Check out the OS20LCD with smart LCD thermostat and 5 operating modes.

📦 What's In the Box

  • OS20 solar air heater main unit
  • Mechanical thermostat
  • 135mm hole saw
  • Air duct & air outlet
  • Mounting accessories & manual

❓ FAQ

How much can I save?

On sunny days, the OS20 provides completely free heating. Over a year, it typically delivers 525 kWh of heating energy – equivalent to €100–200 of electricity or gas, depending on local rates.

Does it work at night?

The OS20 requires sunlight to operate. For nighttime heating, we recommend combining it with your existing heating system or insulating your home well to retain daytime heat.

Is it noisy?

No. The SUNON fan is whisper-quiet. You'll barely notice it running.

✅ Certified & Trusted

TÜV Rheinland | EN12975 & ISO9806 | Solar Keymark | CE marked

Over 4,000 units sold per year. Trusted by customers across Europe.

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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