空气电加热器仪器种类
Types of electric air heater instruments
（1）  按热源和加热方式不同分为：电加热器和直燃式空气加热器。
（1） According to different heat sources and heating methods, it can be divided into electric heater and direct fired air heater.
（2）空气电加热器一般有两种：电阻丝电加热器和陶瓷电加热器。
(2) There are two kinds of electric air heater: resistance wire heater and ceramic heater.
（3）电阻丝电加热器有裸线式和管状两种。
(3) There are two types of resistance wire electric heater: bare wire type and tubular type.
（4）在实际工程中，有电阻丝电加热器和陶瓷电加热器。
(4) In practical engineering, there are resistance wire electric heater and ceramic electric heater.