1立方米水箱的水由25kW的电炉加热，要求水温可以在一定范围内由人工设定，并能在环境温度降低时实现自动调整，以保持设定的温度基本不变-1 cubic meter tank of water heated by a 25kW electric furnace, required a certain range of temperature can be set by hand, and the drop in ambient temperature automatically adjusted to maintain the set temperature is essentially the same