(57) The method outlined in the invention relates to lowering the temperature of the working
medium in addition to the working medium return (b), in a controlled manner and dependent on the maximum temperature difference between
working medium supply (a) and working medium return (b) going back to heat source (B), going back to the heat source (B), cooling thereof with a cooler medium flow going through an additional external heat
exchanger (2), pumped by a cold medium circulation pump (4 or 4a) from the bottom of storage heater (1), filled with hot buffered medium, or from a supply connection (1b1) feeding the storage heater tank (1) with buffered medium. To reduce the working medium temperature in the working medium
return (b) going to the heat source (B) is controlled by a controller (6). The controller input signals being signals from first (6a), second (6b) and third (6c) temperature sensor, used to collect data from the first hydraulic circuit (2a) of the additional external heat exchanger (2) connected in parallel to the working medium return (b) going from storage heater (1) heat exchanger (1a) to the heat source (B), the second hydraulic circuit (2b) of additional external heat exchanger (2), and from the working medium supply (a) to the heat exchanger (1a) of storage heater (1), respectively. Quantity flow control is used for the flow of the cold medium in the
process of cooling the returning working medium.
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