Oil is out Which heating makes the most economic and ecological sense

Oil is out Which heating makes the most economic and ecological sense

Oil is out Which heating makes the most economic and ecological sense

Before Rainer Lang opens the heavy metal door, he takes a quick look through the small insulating glass window. In the climatic chamber today, conditions await him like in the Antarctic: minus 30 degrees, the ground is covered with ice, and a wind machine mercilessly whips hard artificial snow from two cannons against a two by two meter metal box.

This is the latest development from the Remscheid-based heating manufacturer Vaillant, a state-of-the-art heat pump. It should be on the market in just eight weeks. “Then the heating will have to work even under extreme conditions,” says Lang, the senior development engineer at the long-established company. So far it has been doing this: the system’s fan hums bravely in the icy test room.

At the front of the building insulation