The Vitocal 350-A air source heat pump, with a rated heating output of 12.7 to 20.6 kW, is particularly suitable for modernization projects. Thanks to improved vapour injection during the compression process (EVI cycle), flow temperatures of up to 65°C can be achieved—even in windy conditions. This means the Vitocal 350-A is also suitable for installation in older heating systems with radiators. To improve efficiency, we recommend replacing individual radiators with ultra-low temperature radiators