TOPCHANCES Coasts 3KW 50HZ Electric Water Thermostat Swimming Pool Heater Pump for Swimming Pool and SPA 220V The product is small and convenient to install in the circular massage pipe at the bottom of the bathtub. This product is easy to operate and provides a mechanical temperature control switch which can set the temperature according to your temperature. The product is safe and reliable in movement, equipped with water flow switch and ultra high temperature protection switch. All use of mechanical control deviceseconomy and durability. The material of heating thermostat is 316# stainless steel and electric heating tube. It has good corrosion resistance (chlorine corrosion) and durable. Important coasts thermostat outlet can not be fitted to valves or check valves on pipes in the middle of the tub or tub.WARNING Never plug any inlet or outlet at both ends of the thermostat. When the thermostat is running, the water must flow from the inlet and out of the outlet. When the thermostat is installed, the center line of its inlet must be aligned with the centerline of the pump outlet or the centerline of the pipe and should be used with the shortest distance and the least number of corners. The thermostat inlet and outlet itself has a union, Joints, and bonding them to the pipe, to be firmly and then hand and the thermostat on the other half of the tightening, the system pipes, pumps and thermostats must be installed to ensure that the drainage when the internal water can be clean, that can not have Water pipes. The operation of the coasts thermostat is fully automatic, and when the thermostat knob is rotated clockwise to the proper position, the heating indicator lights up and the thermostat is operated for a period of time to maintain the bath corresponding to the thermostat knob .The temperature of the position; when the thermostat knob counterclockwise to the appropriate position when the heating will stop, heating indicator light off. When the system is running for a long time, the thermostat inside the thermostat will keep the water temperature .