Here is a gadget that heats water, so you can take a warm bath. The Wakashitaro Water Heater can handle 79.2 gallons of water. It lets you set the temperature from 86 to 113F. Its sensor sets off a beep if something unexpected is detected.
More gadgets like this: here
多用途加熱＆保温ヒーター 沸かし太郎（SCH 901）
This gadget comes with water level/temperature sensors and overheating and leakage protection.
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