... pre- make use of theequipment . Close the power switch , the green lamp lighted. denote thehave electric, then clock wise circumvolve ... thetemperature controller cut thepower, at that time , the green lamp cut off, theelectronic-heating tubes stop work . when the temperature ... that the water temperatureis constant .2. On the heat control switch, 0 means power off, 50 is the lowestlimit temperature ...