Earlier quoted context omitted.
Couldn't German industry produce more of them? Heat pumps seems like a technology which isn't import dependent in the way that natural gas is, especially if the government were there to help with funding.
It takes a while to spin up production. It also takes a while to find and train a sufficient number of people to can install them. It also takes a while to increase the supply of electricity so that we have enough power for tens of millions of heat pumps running all winter.
The same therm of natural gas that would have been burned in a domestic gas boiler, if burned in a modern combined cycle gas electricity plant, can provide 2-3X the amount of domestic heat via heat pumps even in the coldest conditions. In shoulder seasons it's more like 3-4X.
The load we need to expand electricity production for is EVs, which use a ton of it comparatively.