An arrangement for controlling change in temperature of a fluid, the arrangement comprising: - a first receptacle provided with a first energy exchange element arranged to be able to change the temperature of a first fluid located in the first receptacle, the first receptacle being further provided with a fluid inlet portion and a fluid outlet portion; - a second receptacle provided with a second energy exchange element and a third energy exchange element, each of which are arranged to be able to effect a change in temperature of a second fluid located in the second receptacle, the second receptacle being further provided with a fluid inlet portion and a fluid outlet portion, wherein the arrangement further comprises an energy source that is in fluid communication with the first energy exchange element and the second energy exchange element in a manner making energy from the energy source available, via an energy carrier, firstly to the first energy exchange element for exchanging energy with the first fluid, and then making it available to the second energy exchange element for exchanging energy with the second fluid, wherein the first fluid, which is conducted into the first receptacle from a fluid supply source, is conducted firstly via the third energy exchange element in the second receptacle for exchanging energy with the second fluid, the energy source being arranged to be controlled by a setpoint arranged to be able to sense the fluid temperature in the second receptacle, the setpoint is placed at the fluid outlet portion of the second receptacle, characterised in that the first and the second energy exchange element (5, 9) comprise a piping arrangement connected in series, and wherein an outlet portion of the piping arrangement in the first receptacle is connected to an inlet portion of the piping arrangement in the second receptacle, and that the outlet portion of the piping arrangement in the first receptacle is placed higher than the inlet portion of the piping arrangement in the second receptacle. - a first receptacle provided with a first energy exchange element arranged to be able to change the temperature of a first fluid located in the first receptacle, the first receptacle being further provided with a fluid inlet portion and a fluid outlet portion; - a second receptacle provided with a second energy exchange element and a third energy exchange element, each of which are arranged to be able to effect a change in temperature of a second fluid located in the second receptacle, the second receptacle being further provided with a fluid inlet portion and a fluid outlet portion, wherein the arrangement further comprises an energy source that is in fluid communication with the first energy exchange element and the second energy exchange element in a manner making energy from the energy source available, via an energy carrier, firstly to the first energy exchange element for exchanging energy with the first fluid, and then making it available to the second energy exchange element for exchanging energy with the second fluid, wherein the first fluid, which is conducted into the first receptacle from a fluid supply source, is conducted firstly via the third energy exchange element in the second receptacle for exchanging energy with the second fluid, the energy source being arranged to be controlled by a setpoint arranged to be able to sense the fluid temperature in the second receptacle, the setpoint is placed at the fluid outlet portion of the second receptacle,