| 摘要 |
PROBLEM TO BE SOLVED: To provide a heater device for water tank, improved in safety while reducing its production cost.SOLUTION: The heater device is such that: as a heater case 16 is enclosed by a hollow pipe-shaped cover body 55, such a situation that, owing to the cover body 55, a finger tip comes into contact with the heater case 16 heated at elevated temperatures even if a heater 12 is unloaded by accident into the air during electric current energization is surely avoided; furthermore, as end covers 42 and 43 are detachably fitted onto the heater case 16 and the cover body 55 onto the end covers 42 and 43, even if either the end covers 42 and 43 constituting a heater cover 41 or the cover body 55 is defective, the situation can be dealt with by only detaching it (them) and replacing it (them) by non-defective alternatives. |
