... 3. 4.5 COP, R410a 4. CE approved Ground source heat pumpCooling capacity: 37532BUT/h ~716520BUT/hCOP: 3.9~ ... configuration.A different water tank to choose, pressure or open type connected to meet the different demands of clients. ... refrigerant 410A, no damage, environment friendly. 11.Multi-source designAir source , ground source, solar and electric auxiliary heat integrated together (optional), ...