noun
hot water tank; hot water storage tank
A tank for storing heated water, often used in residential or commercial hot water supply systems.
新しい貯湯槽を設置したので、お湯がたっぷり使えます。
We installed a new hot water tank, so we can use plenty of hot water.
Compound of 貯 (store), 湯 (hot water), and 槽 (tank).