... Water Source Heat Pum -CE Certificate -High Efficiency&Muti-fuction LTWH Series High Quality Ground Source Heat Pump for Houses and ... 54.04.54.86.1Control SystemDedicated heat pump controller,PID regulatorSecurityOverload, high voltage, wrong Phase, water, oil, antifreeze ... LossKpa≤40Interface Dim.DN(mm)2525253232324040405050 LTWH Series High Quality Ground Source Heat Pump for Houses and Commerical Use ...