Feature●Ecosmart Thermistor with Inlet/Outlet Wires for Tankless Electric Water Heaters●Compatible with 18kW, 24kW and 27kW models●Thermistor THRM QC XLRG●Compatible with Tankless Electric Water Heaters with Plastic Cover on Flow Meter●Equivalent model THRM QC MEDLRGDescription Ecosmart Thermistor with Inlet/Outlet Wires for Tankless Electric Water Heaters. Compatible with 18kW, 24kW and 27kW models with Plastic Cover on Flow Meter