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A unit for harnessing solar power for heating water at high pressure, in which the circuit is exposed to freezing, comprising: a heat exchanger made as a single piece for a hydraulic circuit, made up of parallel polymer pipes (1) connected at one end thereof to a main branch-off pipe (2, 3) and, at

A unit for harnessing solar power for heating water at high pressure, in which the circuit is exposed to freezing, comprising: a heat exchanger made as a single piece for a hydraulic circuit, made up of parallel polymer pipes (1) connected at one end thereof to a main branch-off pipe (2, 3) and, at the other end thereof, to a main collector pipe (2, 3); a sealed box (4) for a whole number of units connected in series, having a profile of regular section (5), reinforced by brackets that can be inserted in corners, with a translucent face (6), the other face having an insulated cover (7); the profile having a geometry suitable for connecting the box to a support structure; the profile having a geometry suitable for holding the insulating material (8) and the rubber seals on the inner part of the translucent face (9); the profile being such that complementary profiles (10) may be assembled thereon, by snap-fitting, and the complementary profiles have a housing for rubber seals (11) on the outer part of the translucent face (6); means for connecting a water supply pipe (12) to the main branch-off pipe(s) and means for connecting a discharge pipe (13), in the direction of water consumption, to the main collector pipe(s). Use of the unit with direct connection to a pressurized water heater located on the unit, for heating the water of the water heater by means of circulation by convection. Use of the unit with direct connection to a pressurized water heater, which is in an arbitrary position with respect to the unit, with circulation by a hydraulic pump.

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1. Water-heating solar energy collection unit for high pressure applications and exposure to freezing temperatures, the water-heating solar energy collection unit comprising: a plurality heat exchange units, each heat exchange unit including multiple parallel pipes of polymeric material connected by

1. Water-heating solar energy collection unit for high pressure applications and exposure to freezing temperatures, the water-heating solar energy collection unit comprising: a plurality heat exchange units, each heat exchange unit including multiple parallel pipes of polymeric material connected by thermo-fusion at one end to a main intake manifold and connected by thermo-fusion at another end to a main outflow manifold such that the multiple parallel pipes, the main intake manifold, and the main outflow manifold of each heat exchange unit forms a single piece of the polymeric material; anda water-tight box housing the plurality of exchange units connected in a row, the water-tight box including a translucent face,a thermally insulated cover position opposite the translucent face,a principal frame component configured to connect water-tight the box to a supporting structure and configured to hold insulation material in place inside the water-tight box, anda complementary frame component attached to the principal frame component by elastic interface, wherein the complementary frame and the principal frame bracket the translucent face with a first rubber seal coupled to the complementary frame component position on an exterior surface of the translucent face and a second rubber seal coupled to the principal frame component position on an interior surface of the translucent face. 2. The water-heating solar energy collection unit of claim 1, wherein the parallel pipes of each heat exchange unit are arranged with adequate clearance between adjacent pipes of the multiple parallel pipes for collection of energy, allowing radiation heating of a greatest amount of a circumference of each pipe. 3. The water-heating solar energy collection unit of claim 1, wherein the multiple parallel pips of each heat exchange unit are arranged in a plane parallel to the translucent face and the thermally insulated cover, and wherein the multiple parallel pipes of each heat exchange are positioned at a defined distance from the translucent face and are supported by additional insulating material positioned between the multiple parallel pipes and an inside face of the thermally insulated cover. 4. The water-heating solar energy collection unit of claim 1, wherein the main intake manifold and the main outflow manifold of each heat exchange unit are identical and are formed of a polymer injection-molded material that is resistant to radiation pressure and changes in operating temperatures. 5. The water-heating solar energy collection unit of claim 4, wherein the main intake manifold of each heat exchange unit is formed with connections on both ends for coupling the main intake manifold in a series to the main intake manifold of an adjacent heat exchange unit. 6. The water-heating solar energy collection unit of claim 5, wherein the main intake manifold of each heat exchange unit is coupled to the main intake manifold of at least one adjacent heat exchange unit in a high pressure-resistant, sealed union. 7. The water-heating solar energy collection unit of claim 1, wherein the multiple parallel pipes of each heat exchange unit are manufactured by extrusion molding and are standardized. 8. The water-heating solar energy collection unit of claim 7, wherein the multiple parallel pipes are sized to a standard length. 9. The water-heating solar energy collection unit of claim 1, wherein the translucent face of the water-tight box includes an alveolar commercial polycarbonate sheet. 10. The water-heating solar energy collection unit of claim 1, wherein the translucent face of the water-tight box includes a tempered glass sheet. 11. The water-heating solar energy collection unit of claim 1. wherein the principal frame component is configured to connect the water-tight box to the supporting structure by a rectangular slot on an external side face of the principal frame component. 12. The water-heating solar energy collection unit of claim 1, further comprising the insulation material positioned in a rectangular area formed by the principal frame with an interior side open and covered with a small flap protruding from the translucent face towards the thermally insulated cover. 13. The water-heating solar energy collection unit of claim 1, wherein the principal frame component further includes a flat face arranged proximate to the interior surface of the translucent face and that has a rectangular slot whose entrance is narrower than the slot for coupling the second rubber seal to the principal frame component. 14. The water-heating solar energy collection unit of claim 1, wherein the complementary frame component further includes a flat face arranged proximate to the outer surface of the translucent face and that has a rectangular slot whose entrance is narrower than the slot for coupling the first rubber seal to the complementary frame component. 15. The water-heating solar energy collection unit of claim 1, wherein the complementary frame component is coupled to the principal frame component by an attachment flange, wherein the attachment flange includes an edge of complementary frame component protruding towards a center of the translucent face in a plane parallel to the translucent face, the edge of the complementary frame component extending into a slot on a top edge of an outer face of the principal frame component, anda rear hook of the complementary frame component engaging, by elastic deformation of a tab on the complementary frame component, a fin of the principal frame component protruding towards the translucent face. 16. The water-heating solar energy collection unit of claim 1, wherein the principal frame component further includes a rectangular slot receiving an edge of the thermally insulated cover and where a side of the slot on an exterior surface of the primary frame component protrudes to complete a rectangular section of the primary frame component. 17. The water-heating solar energy collection unit of claim 1, wherein the first rubber seal has a generally-rectangular surface shape, wherein one surface of the generally-rectangular surface shape including grooves and an opposite surface of the of the generally-rectangular surface shape having projection extending away from the generally-rectangular surface shape coupled to the generally-rectangular surface shape by a base that is narrower than the overall width of the projection, and wherein one side of a cross-section of the generally-rectangular surface shape ends in a wedge. 18. The water-heating solar energy collection unit of claim 1, wherein at least one rubber seal selected from a group consisting the first rubber seal and the second rubber seal is manufactured in rubber ethylene propylene diene monomer (EPDM). 19. The water-heating solar energy collection unit of claim 7, wherein the multiple parallel pipes are manufactured from polypropylene R. 20. The water-heating heating solar energy collection unit of claim 19, wherein the multiple parallel pipes each have an outside circumference of 16 mm in diameter. 21. The water-heating heating solar energy collection unit of claim 4, wherein the main intake manifold and the main outflow manifold of each heat exchange unit are manufactured from polypropylene R. 22. The water-heating heating solar energy collection unit of claim 1, wherein the main intake manifold and the main outflow manifold of each heat exchange unit are both coupled to 10 parallel pipes each positioned with a distance between axis of approximately 23 mm. 23. The water-heating heating solar energy collection unit of claim 1, wherein the main intake manifold and the main outflow manifold of each heat exchange unit both have an outside circumference with a diameter of 30 mm. 24. The water-heating heating solar energy collection unit of claim 9, wherein the translucent face of the box includes a commercial alveolar polycarbonate sheet of 4 mm in thickness. 25. The water-heating heating solar energy collection unit of claim 1, wherein the thermally insulated cover includes an inner layer of insulating material made of 25 mm thick mineral wool and a sheet of reinforced polyester. 26. The water-heating heating solar energy collection unit of claim 1, wherein 1 the water-heating solar energy collection unit is directly connected to a thermos pressurized to a pressure of a potable or recreational water network, where the thermos is located over the water-heating solar energy collection unit to allow heating of the water of the thermos through convection or thermo-siphon circulation. 27. The water-heating heating solar energy collection unit of claim 1, wherein the water-heating solar energy collection unit is directly connected to a pressurized thermos to the main network water pressure, where the thermos is located in an arbitrary position with respect to the collection unit and circulation is carried out by an hydraulic pump.