Now lets not overreact even before the war there were 130000 new heatpumps installed in germany every year. It is not like this is entirely unknown territory. Seeing as we actually also produce heatpumps in large scale in germany ourselves, I do not see why we wouldnt be able to install a lot in a few years time. Current goal of the economy and climate minister is 500 000 new heatpumps each year.