heat machine

例句：

1. 1.This electric heater is very efficient and easy to use.
   这个电加热器非常高效且易于使用。
2. 2. The hot-water heater keeps the water warm for the whole house.
   热水加热器为整个房子提供温暖的水。
3. 3.The old heater was too noisy and inefficient, so we replaced it with a new one.
   旧的加热器太吵而且效率低下，所以我们换了一个新的。