| 摘要 |
<p>PROBLEM TO BE SOLVED: To use a hot water device for hot water supply and heat insulation use only by a single hot water device by a method wherein a second storage tank connected from a piping for water-filling connected to the outside of a casing is arranged internally of a first storage tank arranged at the internal part of the casing of a hot water device. SOLUTION: This storage tank structure is related to the storage tank structure of a hot water device to store hot water generated by utilizing a midnight power. A first storage tank T1 sheathed with a heat insulation material, such as glass wool, is arranged at the internal part of a casing 10 of a hot water device 1. A second storage tank T2 is locked at the inside of the first storage tank by a locking fitment. A water filling valve V3, a hot water supply valve V4, and a check valve V6 of the second storage tank T2 are disposed in proper positions in a circulation flow passage P through which hot water stored in a bath tub B is circulated and returned to the second storage tank by a circulation pump P0 and heat-insulated and heated by a hot water device 1 and circulated to the bath tub B again.</p> |
