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1. A set of substantially identical square hydronic heating panels,
(a) each panel having two sides, each side forming a plane, each panel having four edges forming a perimeter of each side, the edges herein designated an edge A, an edge B, an edge C, and an edge D, with the edge A and the edge C being opposite each other and the edge B and the edge D being opposite each other; (b) each panel being traversed by a plurality of grooves for receiving hydronic pipes on at least one of the two sides of the panel forming a grooved side, each of said grooves forming a linear gap in the plane of the grooved side, each of said linear gaps having a non-constant gap width in the plane of the grooved side, (c) the plurality of grooves of each panel having only three straight grooves parallel to one another, two of the straight grooves of each panel being outer grooves and one of the straight grooves of each panel being an inner groove, the plurality of grooves including curved grooves, each straight groove intersecting at least two of said curved grooves of the plurality of grooves and thereby forming intersecting groove portions where two or more of the grooves intersect and non-intersecting groove portions where the grooves does not intersect, (d) all the gap widths at the non-intersecting groove portions being the same, (e) each of said three straight grooves terminating at the edge A at 90° to the edge A and forming an exit, and each of said three straight grooves terminating at the edge C at 90° to the edge C and forming an exit, two of the exits of said three straight grooves at said edge A are at a distance B from each other, two of the exits of the three straight grooves at said edge C are at the distance B from each other, and each of the edge A and the edge C have no exits of any of the curved grooves; (f) at least two of said curved grooves terminating at the edge B at 90° to the edge B forming a first pair of exits at the distance B from one another and at least two of said curved grooves terminating at the edge D at 90° to the edge D forming a second pair of exits at the distance B from one another, the curved grooves terminating at said edge B intersecting a first straight groove of said three straight grooves at a tangent, the curved grooves terminating at said edge D intersecting a second straight groove of said three straight grooves at a tangent, each of the edge B and the edge D having no exits of any the straight grooves; (g) such that, when a first panel and a second panel of the set of substantially identical hydronic heating panels are assembled edge to edge to form a seam with one of the edge A or the edge C of the first panel adjoined to one of the edge B or the edge D of the second panel, each of the two exits of the curved grooves of the edge B or the edge D in the second panel is aligned with one of the exits of said three straight grooves in the edge A or the edge C in the first panel and two of the three straight grooves of the first panel that terminate at the seam are each aligned with one of the exits of the curved grooves at the seam.
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