Patent ID: 6931204

Claim:
An electric water heater comprising: a container for containing liquid, a heater for heating said liquid, a tapping route for discharging water, and a vacuum heat insulator disposed around said container, wherein said vacuum heat insulator comprises a laminate bag, and an insulating core placed in said laminate bag, an inside of said laminate bag is evacuated to vacuum, said laminate bag comprises a laminate film, said laminate film includes a base material layer, a deposition layer evaporated on the surface of said base material layer, a protective layer disposed at the face side, and a seal layer disposed at the back side, said base material layer and said protective layer comprise a plastic film having a glass transition point of 87° C. or higher, said seal layer and said base material layer are mutually adhered by an adhesive layer, and said deposition layer and said protective layer are mutually adhered by an adhesive layer.