Helen, a Helsinki-based energy company, has unveiled plans for a large-scale district heating plant complex. Germany's MAN Energy Solutions is supplying a 33 MW air-to-water heat pump, the largest ever used for a district-heating plant, with ambient air and renewable electricity for heat generation.
It looks like this is not even the largest heat pump man makes, just the largest air to water. This is still significant because it is pulling heat out of ambient air, not some other process fluid.