... pre- make use of theequipment . Close the power switch , the green lamp lighted. denote thehave electric, then clock wise circumvolve the ... work . when the temperature fall down, thetemperature controller can auto switch on the power , the electronic-heatingtubes began work , repeat ... the water temperatureis constant .2. On the heat control switch, 0 means power off, 50 is the lowestlimit temperature ...