Also, the existing water heater will act as a pre-heater for the entire system.
同样，现有的热水器将会当做整个系统的预热部分。
2
This machine equips with pre-heater for liner and pre-conditioner for medium.
本机器内装有面纸预热辊及芯纸调质喷汽装置。
3
The main reasons to the rotary air pre-heater secondary combustion are related to unstable oil gun combustion, internal oil leakage and insufficient soot-blower steam pressure, etc.