Modular placement system for the safe storage of horizontally stacked thermal collector modules, wherein the system is formed exclusively from individual, vertically arranged, load-bearing columns which each consist of moulded part members which, arranged one above the other and placed one inside the other, form the respective column, wherein each of these moulded part members - comprises two limb portions - is equipped on its vertical inner side with a load-absorbing support profile as a bearing apparatus for the thermal collector module, and - is equipped above the load-absorbing support profile on the inner side of at least one limb portion with an aperture for receiving at least one portion of the piping of the thermal collector module, which portion protrudes beyond the lateral edge of the thermal collector module, - wherein the apertures are allocated to the at least one limb portion of the moulded part member, and - is equipped on the upper side or lower side with one or a plurality of pins or a spring, and - is equipped on the lower side or upper side with one or a plurality of open cavities for receiving the pin(s) in a precisely fitting manner, or with a groove for receiving the spring, wherein - the vertical side of each moulded part member facing away from the vertical inner side forms a continuous closed surface, also at the location where the aperture is formed on the vertical inner side; characterised in that at least one collector module is stored in the placement system, the portion of the piping protruding beyond the lateral edge of the at least one stored thermal collector module is received by the aperture of one of the moulded part members with clearance, the aperture is located above the support profile, and - this lateral edge of the thermal collector module lies against the vertical inner side, facing towards the collector module, of the particular limb portion to which the aperture is allocated. - comprises two limb portions - is equipped on its vertical inner side with a load-absorbing support profile as a bearing apparatus for the thermal collector module, and - is equipped above the load-absorbing support profile on the inner side of at least one limb portion with an aperture for receiving at least one portion of the piping of the thermal collector module, which portion protrudes beyond the lateral edge of the thermal collector module, - wherein the apertures are allocated to the at least one limb portion of the moulded part member, and - is equipped on the upper side or lower side with one or a plurality of pins or a spring, and - is equipped on the lower side or upper side with one or a plurality of open cavities for receiving the pin(s) in a precisely fitting manner, or with a groove for receiving the spring, wherein - the vertical side of each moulded part member facing away from the vertical inner side forms a continuous closed surface, also at the location where the aperture is formed on the vertical inner side; characterised in that at least one collector module is stored in the placement system, the portion of the piping protruding beyond the lateral edge of the at least one stored thermal collector module is received by the aperture of one of the moulded part members with clearance, the aperture is located above the support profile, and - this lateral edge of the thermal collector module lies against the vertical inner side, facing towards the collector module, of the particular limb portion to which the aperture is allocated.