"Shut off the electric power supply to heater, close cold water inlet, open a hot water faucet to allow air to enter the system and open the drain valve, which is threaded to receive a standard hose coupling.
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close cold water inlet
关闭冷水入口
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Close the cold water inlet valve and open a nearby hot water faucet.
关闭冷水进水阀，打开附近的热水水龙头。
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