BERLIN — The green future of German heating is a white box the size of a U.S. refrigerator. It also happens to use the same technology.
"A refrigerator takes the temperature from the food inside the fridge and then kind of blows it out," says Wolfgang Gründinger, who heads the start-up Enpal, which sells heat pumps. "And a heat pump is just the other system, like the other way around."
