We dont use refrigerant and it is a single HP with a 930F lift (so huge temperature difference between source and sink temperature). It is more than a heat pum

We dont use refrigerant and it is a single HP with a 930F lift (so huge temperature difference between source and sink temperature). It is more than a heat pump, it is a new Stirling engine architecture, so it can run in reverse (heat to electricity) with an exceptional efficiency