coll-tube heater

例句：

1. 1.The coll-tube heater is designed to keep the room warm during winter.
   管式加热器的设计是为了在冬天保持房间温暖。
2. 2.The cold-tube heater was installed in the kitchen to provide extra heat during the cold season.
   在厨房安装的冷管加热器，在寒冷的季节提供额外的热量。
3. 3.The tube heater is a popular choice for heating small spaces due to its compact size and efficiency.
   由于其紧凑的尺寸和效率，管式加热器是加热小空间的受欢迎选择。