Water / ground source heat pump system (mainly ground-source heat pump) is the utilization of geothermal resources in Europe and the United States has three decades of history, is a mature and reliable heating, refrigeration technology, more resources, free, safe, environmental protection, energy efficient, renewable and other properties used in many countries around the world have been widely used. 
 Water / ground source heat pump system and the operating principle 
 Water / ground source heat pump system and the operating principle is winter in the soil, groundwater, river water, wastewater and other low-grade waste heat energy "take out" the need to pass through the heat pump for heating buildings or hot water tank; summer by heat pump heat from the building in the "take out" the transfer to the soil, groundwater and other low-grade resources, the heat pump compressor driven by entering a small amount of energy doing work, the low-grade heat to higher grade heat transfer. 
 Water / ground source heat pump system main components 
 (Geothermal exchange system) to source (water) heat pipe heat exchange medium to loop driven by the circulation pump in different operating conditions and soil and groundwater to heat exchange, which will be transmitted to the heat absorption and heat pump units . Absorption heat pump part of the soil, groundwater and other resources in the heat of the heat exchange medium into the heat pump unit in the evaporator, the refrigerant circulation line in the heat absorbing medium, is compressed by the compressor, the temperature can rise to 40 - 90 ℃, then the refrigerant into the condenser, the refrigerant condensing heat transfer when released into the water, through the circulation line transferred to the cooling system or stored in a holding tank. 
 End System 
 ● Making use of domestic hot water heat pump unit shall be equipped with appropriate insulation and heat pump hot water tank connection. 
 ● use of heat pump heating, the user can choose, including traditional cooling system and floor heating system, fan coil and heat pump units and other terminal equipment supporting. 
 Features 
 ● energy efficiency higher than 20% of heat pump air to -30% more energy efficient operation, COP value of 4.3 to 8. 
 ● unit operation from the air ambient temperature, more stable, four quarters a year more to ensure that production of hot water. 
 ● system of hot water while at the same air conditioning. 
 ● Hot water system is not cooling energy consumption at the same time. 
 ● Cooling water can be groundwater, heat water, air-conditioning cooling tower water, and air-conditioning chilled water for air conditioning systems can be cascaded while producing hot water. 
 ● use of groundwater programs, can be used for winter heating use. 
 ● European countries, the most common heat pump heating and hot water supply unit. 
 ● ground water or soil temperature is relatively stable, more durable and stable operation. .