1. Transmission heating: Like metal rods, heating from a to B in our daily life, that is to say, this heating method has a lot of damage. Therefore, people usually use this heating method and cooking is essential. 

2. Heat convection heating: This heating method is the compound heat convection heating of gas and steam. This kind of radiator will cause organic chemical thermal damage and thermal physical damage of jet fan. 

3. Microwave radiation heating: This kind of ray heating has obvious particularity, just like black clothes absorb heat in the sun. The sun is understood to be the source of microwave radiation, and the thermal effect of this kind of radiation heating is very high.