... -Water Source Heat Pum -CE Certificate -High Efficiency&Muti-fuction LTWH Series High Quality Ground Source Heat Pump for Houses and Commerical ... SystemDedicated heat pump controller,PID regulatorSecurityOverload, high voltage, wrong Phase, water, oil, antifreeze switch, high temperature protectionCompressorFormFlexible all closed scroll typeQuantityset11111111111RefrigerantTypeEnvironmental ...