Uncertainty about the future of state subsidies for eco-friendly heating systems led to a sharp increase in applications submitted to the KfW at the end of the year. This is shown by figures provided by the responsible Federal Ministry for Economic Affairs (BMWK) on request. In the week before Christmas (December 16 to 22), 16,821 main applications and 3,358 additional applications for further residential units were received; this is more than twice as many per week as in the previous three weeks and around four times as many as the weekly figures in October.