| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluid heater which can suppress the generation of the excessive heating of fluid when a flow of the fluid is stopped for a short period of time accompanied by the changeover of a flow passage by flow passage changeover means, in a fluid heater which heats the fluid, and supplies it to the flow passage via the flow passage changeover means.SOLUTION: In a state that heating means arranged at a fluid vessel performs an output, flow passage changeover means performs a changeover operation for switching the supply and stop of fluid to a flow passage from the fluid vessel, and when the supply of the fluid to the flow passage from the fluid vessel is temporarily stopped, an output of the heating means is feed-forward controlled at an output value which is not higher than an output value at feedback control before the flow passage changeover means performs the changeover operation. |
