名词
中文翻译：封闭式循环家用热水器
同义词：
['closed loop domestic hot water heater', 'closed loop water heater']
例句：
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1. The closed-loop system is designed to conserve energy and reduce waste.
这种封闭式系统旨在节约能源和减少浪费。
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2. The closed-loop system is a popular choice for many households due to its efficiency and cost-effectiveness.
由于其效率和成本效益，许多家庭选择封闭式系统作为首选。
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3. The closed-loop system ensures that the water is heated only when needed, reducing energy consumption and saving on heating costs.
封闭式系统确保只在需要时加热水，从而降低能源消耗并节省加热费用。