It is a heat storage with a different Heizwassertemperaturen (4, 4 ', 4 ") having Heizwasserspeicher (2), with a circulating connected to the Heizwasserspeicher (2) and a free convection (8) of the heating water (5) having flow channel (6 or 7) and with at least one duct (9, 10) provided in the flow channel (6 or 7) for guiding a liquid (11, 12) which is in heat exchange with the heating water (5), in order to provide advantageous constructional conditions , It is proposed that at least the wall (15 or 17) of the flow channel (6 or 7) at least partially has a thermal insulation (16 or 18).
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