In 2021, Germany saw sales of heat pumps reach 154,000, with year-on-year growth of 28%, according to joint sales statistics on the heating market from BDH, the German Heating Industry Federation, and BWP, the German Heat Pump Association. A breakdown shows that air-to-water (ATW) heat pumps experienced the greatest year-on-year growth of 33% with 127,000 units sold, and their market share increased to 82%, up from 79% in 2020. The monobloc type accounted for around 83,500 units with 48% growth, and the split type accounted for 43,500 units, with 12% growth. One of the factors behind this strong growth is thought to be the heat pump subsidy system implemented by the German government.