My offer "Heliotherm mini" - Automatic ventilation:

This solar collector is unique in the world, comparable sells no bigger company I know. It has been developed by me exclusively for ventilation, because many people only use e.g. Ventilate your basement and do not want to heat. The Heliotherm mini is very small, compact, simple and durable without any follow-up costs - automatic ventilation for "eternal times" (lifetime estimate between 20 and 40 years) without power consumption.

Make a simple wall duct and an air outlet in the basement or the basement window or an outside door and assemble the Heliotherm mini, ready. The system runs automatically without power, you do not need to lay any annoying cables and the price is unbeatable, cheaper it's not.

The asterisks are meant as an example, as a change, maybe you want to install a red eye-catcher on one of your windows. I can paint you the Heliotherm in any color.

 119 €  in a comlet package

Warranty: 10 years

Weight: 2.9 kg

Dimensions: 45 x 37 x 10 or even smaller

Power: about 5 watts per hour

Fan: 76 m³