Kardia Standard V.102, Руководство пользователя

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The hot water heater has two 3kw heaters, each connected to a
temperature sensor. The upper heater will activate when the hot
water heater fills with cold water. Once the upper water
temperature reaches 70°C, the upper heater will cut out, and the
lower heater will start, until the full tank of water is at 70°C. As
hot water gets consumed, the lower heater will start to heat up
the cold water. When a large quantity of hot water is used in a
short period of time, the upper heater starts again as the hot
water heater gets filled with cold water.