3 - 4m² (32 - 43 sq feet) of solar thermal panels will cover 90% of the hot water needs for a two person household throughout the year. The hot water tank will take over during cloudy days. If there are more inhabitants, and therefore more water being consumed, you need to increase the size of the solar panels. For example, 6m² (64.5 sq feet) for 6 people.
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