Germany’s Vaillant has developed an air-source heat pump that uses propane (R290) as the refrigerant. It can produce between 3.5 kW and 12 kW of heat, and domestic hot water to a temperature of up to ...
The boxy machines look and function like large air-conditioners on reverse, but Germans hope they hold the key to Europe’s push for fossil-free heating. By Melissa Eddy and Patrick Junker Photographs ...
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