Cartridge Heater, Film Heater, Silicone Rubber Heater manufacturer / supplier in China, offering 48V 500W Resistance Electric Tubular Solar Water Heater Elements with Thermostat, Dual Voltage 48V 500W 220V 1000W Electric Solar Water Heater Element for Solar Panels with Thermostat, 12V 24V DC 1000W 500W Tubular Immersion Water Heater Element DC 48V for Solar Panels with Thermostat and so on.