A heat exchanger has a heat-exchanger unit includes one or more substantially coaxial coiled tubes and a casing for housing the heat-exchanger unit. The casing has a first end wall, a second end wall, and a peripheral part between the two end walls. Each tube has a first end and a second end. The heat-exchanger unit is supported by the first end wall of the casing, with the first end and the second end of each tube that is located substantially at the first end wall of the casing.
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