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.

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

Dec 20 2021 1 Comments


Read the details:  Product-description


Heating outdoor fresh air: available in spring, autumn and winter.

OS22/OS32/OS42:  2-in-1 function

Heating outdoor fresh air: suitable for all models.

Heating indoor air circularly mold: can keep heating the room air and increasing the room temperature, and can keep away from any wet or cold or smog air. This mode is the best way to heat the room. Applicable to OS22/32/42.

OS22/32/42: It is possible to use only air intakes that heat fresh outdoor air, and don't use the air outlet that heat indoor air.

Read the details: Easy to install and operate

Read the details: Video and file download


20 December 2021
Richard Walker

Hi I have a OS30 and the vent was accidentally pulled out of the wall . The wires have come off – can you provide me of details of whic coloured wires are supposed to go where so I can solder them back on ?

Thanks, Richard.

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