加热水源
Heating water source
以上为机器翻译结果，长、整句建议使用 人工翻译 。
采用蒸气、电辅加热或外接热水源。
By steam, electric auxiliary heating or external hot water.
youdao
热泵热水器是从环境和水源中泵取热能来加热冷水，在运行时只需花少量驱动“热泵”(压缩机)的电力费用。
Heat pump water heater and water from the environment in the pumping energy to heat cold water, run only takes a small amount of drive, "heat" (compressor) power costs.
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