This is the vertical closed-loop geothermal system and this method makes depth of ground heat exchanger installation up to 300m or more compared to existing technology. Thus, this can improve economic feasibility as increasing heat efficiency. There are 4 characteristics of this product, 1) Install weigh band and weight added device on the exterior and lower part of the geothermal coil pipe to increase the weight per unit and this can solve buoyancy problems. 2) It has various types of geothermal coil pipe (i.e. 2,4) and expand the diameter of geothermal coil pipe to improve heat exchange rate. 3) The manhole and leakage sensor are installed for maintenance and inspection on the ground burial area 4) Install the smart tag on geothermal boreholes and ground pipe by using internet of things (loT) technology to know accurate location of geothermal boreholes.