In general, the water heater in the middle temperature state is the most energy-efficient.
一般来说，热水器工作在中温状态是最节能的。
2
The induction electric heater is in a double-rectangular shape with an opening in the middle, and is formed by winding an induction wire harness.
其中感应电加热器呈中间具有开孔的双矩形，其是由感应线束缠绕而形成。
3
The innovation using the natural gas to air as fuel to provide the heater in place of middle pressure dry gas in one crude oil stabilization plant is introduced in this paper.