The outdoor heat pump unit of the PUHZ-AA ecodan series for residential air-to-water heating systems replaces conventional combustion boilers with an energy-saving, clean heat source and reduces CO2 emissions. Its housing is highly compact and slim, and the colour combination of white and anthracite exudes a simple yet elegant appeal. The dark colour of the fan section underlines the unobtrusive design. The large internal fan runs very efficiently at low speed, ensuring lower noise emission.