x-change ® dynamic pro air-to-water heat pump Highest efficiency, lowest sound emissions, state-of-the-art control technology. The x-change dynamic pro air/water heat pump stands for maximum [...] x-change ® dynamic pro air-to-water heat pump Highest efficiency, lowest sound emissions, state-of-the-art control technology. The x-change dynamic pro air/water heat pump stands for maximum efficiency, minimal sound emissions and state-of-the-art control technology. Developed with the environmentally friendly refrigerant R290 (propane), it offers a future-proof and [...]