Unverified78% confidenceTradeoffTime unknown
能效等级差异对电热水器实际电费影响有限（加热能耗主要取决于进出水温差与用水量），一级比二级省的是保温待机能耗，若习惯用完就断电则一级溢价性价比低
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78%
Confidence
Long-term
Relevance
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