Just open a hot water valve in a sink or shower and let the system drain.
我们只要打开浴缸或淋浴喷头的热水出水阀，把热水器的水放掉就行了。
After turning off the gas or electricity open the drain valve at the tank bottom.
在关闭燃气或电源后可开启罐底的排水阀。
Students check the automatic drain valve of the front end of the valve is open.
检查自动排水阀前端之球阀是否打开。
Students check the automatic drain valve of the front end of the valve is open.
检查自动排水阀前端之球阀是否打开。
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