Modular floor heating distributor comprising - multiple distributor modules which each have one supply duct, which is open on both sides in the module longitudinal direction, one return duct, which is open on both sides in the module longitudinal direction, one supply connection, which opens into the supply duct, and one return connection, which departs from the return duct, on the bottom side of the distributor module, - a connection module which is arranged on an end-side distributor module and which has a supply duct, which is open at least on one side in the module longitudinal direction, a return duct, which is open at least on one side in the module longitudinal direction, and a connection pipe piece, which opens into the supply duct that is open on the end-side, and a connection pipe piece, which departs from the return duct that is open on the end side, and - an end module which is arranged on the other end-side distributor module and which has a supply duct, which is open on one side in the module longitudinal direction, and a return duct, which is open on one side in the module longitudinal direction, wherein the individual modules (2, 3, 4) are connected to one another in a tight manner in the module longitudinal direction, and their supply and return ducts (7, 8), in the installation position of the floor heating distributor, run adjacent to one another in a horizontal and parallel manner, so that their supply ducts (7, 19) and return ducts (8, 20) in each case form a continuous supply strand and return strand, characterized in that, on the top side of the distributor module, provision is made of in each case one supply shut-off spindle for shutting off the supply connection and one return shut-off valve for shutting off the return connection, and, on the top side of the connection module, provision is made of a shut-off valve which shuts off and is attached to the supply line, and in that one of the two connection pipe pieces (14, 15) is of straight form and the other one is of angled form, wherein the connection pipe pieces (14, 15), in the end-side openings (16, 17) of the supply and return ducts (7, 8), are each secured by means of a securing clip. - multiple distributor modules which each have one supply duct, which is open on both sides in the module longitudinal direction, one return duct, which is open on both sides in the module longitudinal direction, one supply connection, which opens into the supply duct, and one return connection, which departs from the return duct, on the bottom side of the distributor module, - a connection module which is arranged on an end-side distributor module and which has a supply duct, which is open at least on one side in the module longitudinal direction, a return duct, which is open at least on one side in the module longitudinal direction, and a connection pipe piece, which opens into the supply duct that is open on the end-side, and a connection pipe piece, which departs from the return duct that is open on the end side, and - an end module which is arranged on the other end-side distributor module and which has a supply duct, which is open on one side in the module longitudinal direction, and a return duct, which is open on one side in the module longitudinal direction, wherein the individual modules (2, 3, 4) are connected to one another in a tight manner in the module longitudinal direction, and their supply and return ducts (7, 8), in the installation position of the floor heating distributor, run adjacent to one another in a horizontal and parallel manner, so that their supply ducts (7, 19) and return ducts (8, 20) in each case form a continuous supply strand and return strand, characterized in that, on the top side of the distributor module, provision is made of in each case one supply shut-off spindle for shutting off the supply connection and one return shut-off valve for shutting off the return connection, and, on the top side of the connection module, provision is made of a shut-off valve which shuts off and is attached to the supply line, and in that one of the two connection pipe pieces (14, 15) is of straight form and the other one is of angled form, wherein the connection pipe pieces (14, 15), in the end-side openings (16, 17) of the supply and return ducts (7, 8), are each secured by means of a securing clip.