can keep the solar water heater on working order ,When the cloudy sky or clouded or sunshine shortage .
Solar water heaters assistant heating tube .
Our special heating tube can keep the solar water heater on working order ,When the cloudy sky or clouded or sunshine shortage .
it is waterproof heating tube , this heating tube can put into the tank of solar water heater , When the cloudy sky or clouded or sunshine shortage , The temperature of water in tank less than 50 centigrade , this special heating tube will turn-on electric automatic , when the water is heating up to 90 centigrade , it will turnoff automatic .
Life time : 5000 hours
solar water heater 's assistant heating tube .
