... for cooling,heating,hot watergeothermal heat pump make use of water from river, lake, underground to transfer heat into ... compared with oil boiler, gas boiler, coal boiler, electricity water heater etc.Environment-friendly: ODP---Ozone Depletion Potential, GWP--Global ... heat energy in the air and transfer it to heat water through heat exchanger. 3)no potential hazards of inflammable, explosive, ...