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

🏠 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

✅ 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.

🇩🇪 Germany customers: OS42 qualifies for BAFA solar subsidy. Apply before purchase.

Oscar Science & Technology Co., Ltd. is a professional manufacturer of solar air collector/ heater, solar ventilator etc. Nakoair® Solar with LCD thermostat, provide you with a healthy and warm home and automatically processes indoor air. Simple operation, thoughtful air management expert! 

Owning Patent and certificates as ISO9001:2015, German TUV NORD CERT; European Solar Keymark certification(ISO9806); TÜV Rheinland test reports etc.

With a developing and testing labs, tests are strictly applied as air volume, temperature difference of different models in different conditions, also insulation, UV-resistance, climate-resistance, water-proof to various materials such as coating and silicone. Thus Nakoair® is supplying products in better quality.

Innovatively adopting high-tech material like low iron ultra-pure glass and Special texture nano insulation coating etc, the company dedicates to sustainable development and innovations.

Nakoair® solar air heaters are sold to many countries like UK, Denmark, Germany, Czech, Australia, New Zealand, Canada, America etc. In the past years, with continuous improvement and innovation, Nakoair® solar air heater is popular due to its high performance and competitive price.

Oscar Science & Technology Co., Ltd.

Address: Albert-Schweitzer-Str.1 Tor 20 55459 Grolsheim Germany

Email: info@nakoair.net

Distributors and installers are welcome! Your address, email, and phone number will be published. You will be  promoted to a wider customer base through Google Ads and other means. Local customers will buy from you or hire you for installations：

Recruiting-partners

Refund and return policy

We have a 15-day return policy, which means you have 30 days after receiving your item to request a return.

To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
You can always contact us for any return question at info@nakoair.net.

Damages and issues

Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.

Exchanges

The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.

Refunds

We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please remember it can take some time for your bank or credit card company to process and post the refund too.

The buyer is responsible for paying the return shipping fee ( Except for quality problems or logistics damage).

Return address:
Frankfurt warehouse, Germany
Recipient (Consignee)
4PX DEGRS 75Z52CX
Address
Albert-Schweitzer-Str 1
City
Grolsheim
State/Prov. (State/Prov.)
Rheinland-Pfalz
Country
Germany
Zip Code (ZipCode)
55459
Telephone (Tel)
0151-66342177

London warehouse
Recipient (Consignee)
4PX UKGRS 75Z52CX
Address
Leicester Commercial Park Unit 1, Dorsey Way
City
Enderby
State/Prov. (State/Prov.)
Leicester
Country
United Kingdom
Zip Code (ZipCode)
LE19 4DB
Telephone (Tel)
01582-477267

Paris warehouse, France
Recipient (Consignee)
4PX FRGRS 75Z52CX
Address
8 rue de la Patelle, Bat-3, Porte-310
City
Saint-Ouen-l'Aumône
State/Prov. (State/Prov.)
Val-d'Oise
Country
France
Zip Code (ZipCode)
95310
Telephone (Tel)
0767620833

Madrid warehouse, Spain
Recipient (Consignee)
4PX ESGRS 75Z52CX
Address
C/ Rayo, Modulo 2 Parc. 2.4 Pol. Ind. La Quinta
City
Cabanillas del Campo
State/Prov. (State/Prov.)
Guadalajara
Country
Spain
Zip Code (ZipCode)
19171
Telephone (Tel)
916997679

Los Angeles warehouse
Recipient (Consignee)
4PX USGRS 75Z52CX
Address
5610 Grace Pl
City
Commerce
State/Prov. (State/Prov.)
California
Country
United States of America
Zip Code (ZipCode)
90022
Telephone (Tel)
3235970311
New York warehouse
Recipient (Consignee)
4PX USGRS 75Z52CX
Address
1000 High St
City
Perth Amboy
State/Prov. (State/Prov.)
New Jersey
Country
United States of America
Zip Code (ZipCode)
08861
Telephone (Tel)
7184542809