热水器能效由能量因数或(EF)来测定，EF值越大，热水器的能效就越高。
The energy efficiency of a water heater is measured in energy Factor or (ef). The larger the number of ef, the more efficient the water heater is.
热水器能效由能量因数或(EF)来测定，EF值越大，热水器的能效就越高。
The energy efficiency of a water heater is measured in energy Factor or (ef). The larger the number of ef, the more efficient the water heater is.
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