These things are 2 to 3 times more efficient than most electric water heaters.

这些东西的效率比大多数电热水器高 2 到 3 倍。

And most of us have gas or electric water heaters, but now you can also get a heat pump water heater.

我们大多数人都有燃气或电热水器，但现在您也可以购买热泵热水器。