| 摘要 |
A flow heater comprises a heating element (48; 248) and a first heating region (18, 20; 218, 220) heated by the heating element (48; 248) for heating liquid flowing therethrough to a first temperature below boiling. The flow heater also comprises a second heating region (22; 222) for heating the liquid to a second temperature below boiling. The second region (22; 222) has means (25; 225) for permitting the exit of steam therefrom separately from heated liquid. The flow heater cannot be operated so that bulk boiling of said liquid takes place in the second region (22; 222). |
