(57) A storage boiler having a hot water reservoir (1, 101), a tap water supply (6, 106),
communicating with the reservoir (1, 101), for supplying tap water, and a tap water
discharge (7, 107), communicating with the reservoir (1, 101), for delivering heated
tap water from the reservoir (1, 101), further comprising water displacement provisions
(10-15, 106, 107, 110, 111, 115, 116, 120-123, 130) (9, 109) for displacing water
present in the reservoir (1, 101) within the reservoir (1, 101). By displacing water
from one place to another place in the reservoir, Legionella growth in water that
is relatively cool for a long time in the reservoir is controlled. Also described
is a method utilizing this principle.
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