TOPCHANCES Coasts 5.5KW 220-240V 50HZ Water Thermostat for Home Small Swimming Pool and SPA Voltage: 220-240V /Power: 5.5KW 50HZ Feature: Computer Control Panel Main Material: stainless steel ST series pool heaters are special used for small pool less than 5CBM, massage pool and hot spring to heat and keep warm; Meanwhile, can be a assistant for hot pump in heating This product adopts latest constant temperature controller- -temperature sensor replaces traditional magnetic flow switch, it improves greatly of trouble free in working time, adaptability of water environment and stability