Abstract: A heat exchanger includes a plurality of tubes arranged in a juxtaposed configuration, and at least one first manifold member on the outside of the tubes. Each tube is wound to define a planar spiral, having a plurality of co-planar turns, and has an end portion, which extends starting from the inside of the corresponding planar spiral towards the outside thereof. The end portion is superimposed on the co-planar turns, in a position corresponding to a major face of the planar spiral, for connection to the manifold member. tube has a transverse depression defined in the co-planar turns at the major face of the planar spiral, and the transverse depression at least partially receives a a corresponding part of the end portion.

Abstract: A heat exchanger for a heating device includes a plurality of tubes arranged in a juxtaposed configuration, and at least one first manifold member on the outside of the tubes. Each tube is wound in a spiral having a plurality of substantially co-planar turns including at least one inner turn and at least one further turn around the inner turn. At least one first tube has a first end portion, which extends starting from the inner turn towards the outside of the corresponding spiral, with at least one part of the first end portion that is superimposed on the at least one further turn in a position corresponding to a major face of the spiral, for connection to the at least one first manifold member. The at least one first tube has at least one transverse depression in which a corresponding part of the first end portion is at least partially received.

Abstract: 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.

Abstract: A heat exchanger has an exchanger unit, including at least one first coiled conduit and one second coiled conduit that are substantially coaxial, and a casing for housing the exchanger unit. The casing has a first end wall, a second end wall, and a peripheral part between the two end walls. Each conduit has an inlet and an outlet, where the outlet of the first conduit is connected substantially in series to the inlet of the second conduit. The exchanger unit is supported by the first end wall of the casing, with the inlet of the first conduit and the outlet of the second conduit which are substantially at the first end wall of the casing.

Abstract: A heat exchanger has an exchanger unit, including at least one first coiled conduit and one second coiled conduit that are substantially coaxial, and a casing for housing the exchanger unit. The casing has a first end wall, a second end wall, and a peripheral part between the two end walls. Each conduit has an inlet and an outlet, where the outlet of the first conduit is connected substantially in series to the inlet of the second conduit. The exchanger unit is supported by the first end wall of the casing, with the inlet of the first conduit and the outlet of the second conduit which are substantially at the first end wall of the casing.

Abstract: A heat exchanger comprises a casing, within which there is present a first pipe wound in a spiral, in which a first fluid flows, the casing being designed to receive a second fluid that is in heat-exchange relationship with the first fluid. The heat exchanger further comprises at least one second pipe wound in a spiral, which connects, in parallel to the first pipe, two gaps formed in the casing, the spiralled pipes being arranged in a coaxial way and at a distance from one another, and having different sections of passage.

Abstract: An instantaneous heat exchanger for heating sanitary water in a combined boiler has a casing defining a chamber for a first fluid, within which there extends a conduit or tubing for a second fluid. At least one of the chamber and the conduit has a substantial capacity of containment of the respective fluid, preferably between three and six litres, and the heat exchanger is pre-arranged for hydraulic connection to a standardized connection assembly for an ordinary plate-type heat exchanger for a combined boiler.

Abstract: A heat exchanger (1) comprises a casing (2, 13, 28, 33), within which there is present a first pipe wound in a spiral (25), in which a first fluid flows, the casing (2) being designed to receive a second fluid that is in heat-exchange relationship with the first fluid. The heat exchanger further comprises at least one second pipe wound in a spiral (26, 27), which connects, in parallel to the first pipe (25), two gaps (15, 36) formed in the casing (2, 13, 28, 33), the spiralled pipes (25, 26, 27) being arranged in a coaxial way and at a distance from one another, and having different sections of passage.