Tubular Heater, Cartridge Heater, Ceramic Heater manufacturer / supplier in China, offering 3kw 6kw 9kw 12kw Electric Flange Water Immersion Heater for Swimming Pool, 10X300mm 230V 800W Built in Thermocouple Cartridge Heater, 235W 400W 6mm X 288mm Electric Heating Rod Cartridge Heater and so on.