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A heating block for use in a water heater for heating water, having a heating block body, in particular made of plastic, for forming a cavity for conducting the water and for receiving at least one heating element. The heating block body includes a first partial shell having a first sub-cavity and a

A heating block for use in a water heater for heating water, having a heating block body, in particular made of plastic, for forming a cavity for conducting the water and for receiving at least one heating element. The heating block body includes a first partial shell having a first sub-cavity and a second partial shell having a second sub-cavity. The first and the second partial shells are assembled in a joining region and form between them the cavity from the two sub-cavities. The joining region is not formed, at least partially, in a joining plane and/or the first and the second partial shells are welded together by the supply of heat via a medium, in particular, an essentially abrasion-free and/or vibration-free welding process, and/or the first partial cavity has a greater depth than the second partial cavity or vice versa.

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1. A heating block for use in a calorifier for heating water, comprising a heating block body, composed in particular of plastic, for forming a cavity for conducting the water and for accommodating at least one heating element, wherein the heating block body comprises: a first partial shell with a f

1. A heating block for use in a calorifier for heating water, comprising a heating block body, composed in particular of plastic, for forming a cavity for conducting the water and for accommodating at least one heating element, wherein the heating block body comprises: a first partial shell with a first sub-cavity anda second partial shell with a second sub-cavity, whereinthe first and the second partial shell are placed together in a joining region and form between them the cavity composed of the two sub-cavities, and the joining region is at least partially not formed in a joining plane, and/orthe first and the second partial shell are welded to one another by means of a medium through the supply of heat, in particular are welded by means of a substantially abrasion-free and/or vibration-free welding process, and/orthe first sub-cavity has a greater depth than the second sub-cavity or vice versa,wherein a third partial shell is provided which is placed together with the first or second partial shell such that the first or second and the third partial shell form between them an insulation duct for forming an insulation path, wherein the insulation duct is in particular free from heating elements. 2. The heating block as claimed in claim 1, wherein the first and the second partial shell are each formed as plastics injection-molded parts. 3. The heating block as claimed in claim 1, wherein the cavity forms a heating duct for accommodating at least one heating element and the heating duct is arranged between the first and the second partial shell in a first duct plane of extent, and the insulation duct is arranged between the second and the third partial shell in a second duct plane of extent, in particular such that the first, second and third partial shells form a sandwich structure. 4. The heating block as claimed in claim 1, wherein the heating duct has meandering duct sections, and/or the insulation duct has straight duct sections, which are connected to one another approximately at right angles. 5. The heating block as claimed in claim 1, wherein the first and the second partial shell and optionally a or the third partial shell are placed together and fixedly connected by means of hot-gas welding. 6. The heating block as claimed in claim 5, wherein at least one insulation duct has an inlet point for the supply of the medium and at least one insulation duct has an outlet point for the discharge of the medium, and/or the inlet point and outlet point are/is fixedly connected to one of the partial shells. 7. The heating block as claimed in claim 1, wherein the at least one heating element has a component through which electrical current flows, in particular a heating coil. 8. The heating block as claimed in claim 1, wherein the meandering heating duct has a wall thickness which is uniform substantially throughout, in particular has a wall thickness which is uniform throughout in the circumferential direction of the heating duct. 9. The calorifier for heating a liquid medium, comprising a heating block as claimed in claim 1. 10. The calorifier as claimed in claim 9, wherein the calorifier has a casing, in particular a housing, comprising a rear wall, a front wall, a first and a second side wall, a cover and a base, wherein one partial shell, in particular the third partial shell, of the heating block is formed as a constituent part of the rear wall. 11. The calorifier as claimed in claim 9, wherein the calorifier is designed for use in an over-table arrangement and/or under-table arrangement. 12. The partial shell designed for use for producing a heating block as claimed in claim 1, comprising a joining surface designed for welding to a further joining surface of a further partial shell, wherein the joining surface is at least partially not arranged in a joining plane. 13. The partial shell designed for use for producing a heating block as claimed in claim 1, comprising two water ports, wherein one water port forms a water inlet point and one water port forms a water outlet point, wherein at least one water port is situated at least outside one of the joining planes and is formed out of one of the partial shells, and wherein, in particular, the water inlet point and/or the water outlet point defines a flow direction which is substantially parallel to the joining plane. 14. A heating block for use in a calorifier for heating water, comprising a heating block body, composed in particular of plastic, for forming a cavity for conducting the water and for accommodating at least one heating element, wherein the heating block body comprises: a first partial shell with a first sub-cavity anda second partial shell with a second sub-cavity, whereinthe first and the second partial shell are placed together in a joining region and form between them the cavity composed of the two sub-cavities, and the joining region is at least partially not formed in a joining plane, and/orthe first and the second partial shell are welded to one another by means of a medium through the supply of heat, in particular are welded by means of a substantially abrasion-free and/or vibration-free welding process, and/orthe first sub-cavity has a greater depth than the second sub-cavity or vice versa,wherein the cavity has at least one meandering heating duct, wherein the heating duct has at least one heating section with the heating element for heating the water, and wherein,in the first and the second partial shell, in each case one first and second duct half of the heating duct is in the form of a first and second meandering channel or groove respectively, andthe first meandering groove or channel has a greater depth than the second meandering groove or channel or vice versa,wherein the meandering heating duct has heating sections with opposite flow directions arranged parallel to one another, and between the heating sections arranged parallel to one another, there is arranged at least one intermediate duct for separating the potentials, wherein the at least one intermediate duct is connected to a heating section at a diversion point, and the intermediate duct in particular does not have a heating element. 15. The heating block as claimed in claim 14, wherein the heating duct has a larger duct circumference in straight sections than in one or all of the diversion points and/or in the intermediate duct. 16. The heating block as claimed in claim 1, wherein the heating block has water ports for use in the case of over-table and under-table arrangements.