Switch off all gas heater pilot lights when not in use.
关闭不使用的气体热水炉。
The aim is to switch the whole country over to electrical heater.
目的是使全国都能改用电暖气。
The pressure tank is provided with a pressure gauge, a pressure switch, a liquid level sensor and an electric heater.
压力罐装有压力表, 压力开关, 液位传感器和电加热器。
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