Boiler plainA simple water boiler (according to figure 1) cannot see the water level in check. Therefore, We need to shift the upper lid is open. The user will be pouring water into it, and most of the time, it is pouring water into it always exceeds demand, such as hot water for two cups of coffee, which is about 400 cc of water is to be used, but it may be pouring water into the pot as much as 700 c or maybe just water until fully cooked, so check on the water, so it must use more energy and time consuming.
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