Power module for a heating controller and/or regulator, having a housing which comprises - a first communication interface and a second communication interface, wherein the first communication interface can be connected to a second communication interface (4 or 36) of another power module or of an interface module, and the second communication interface can be connected to a first communication interface of another power module, - a first voltage supply interface and a second voltage supply interface for the voltage supply of the power module, wherein the first voltage supply interface can be connected to a second voltage supply interface of another power module or of an interface module and the second voltage supply interface can be connected to a first voltage supply interface of another power module, - a plurality of power outputs to which a heating element can be electrically attached in each case, in particular a radiant heater in each case, - a power input, which can be electrically attached to a voltage supply for the heating elements, wherein the power module has, enclosed by the housing, components as follows: - a power distribution device, which is electrically connected on the input side to the power input and is electrically connected on the output side via a branch in each case to the power outputs in order to supply these with electrical current from the voltage supply, - a switch element in each of the branches, - a control and/or regulation unit, which is so configured as to control and/or regulate the switching state of the switch elements as a function of reference values for a heating power of the heating elements, - a communication unit, which is so configured as to receive reference values intended for the power module via the first communication interface and to transfer these to the control and/or regulation unit, and to forward reference values received via the first communication interface and not intended for the power module to the second communication interface. - a first communication interface and a second communication interface, wherein the first communication interface can be connected to a second communication interface (4 or 36) of another power module or of an interface module, and the second communication interface can be connected to a first communication interface of another power module, - a first voltage supply interface and a second voltage supply interface for the voltage supply of the power module, wherein the first voltage supply interface can be connected to a second voltage supply interface of another power module or of an interface module and the second voltage supply interface can be connected to a first voltage supply interface of another power module, - a plurality of power outputs to which a heating element can be electrically attached in each case, in particular a radiant heater in each case, - a power input, which can be electrically attached to a voltage supply for the heating elements, - a power distribution device, which is electrically connected on the input side to the power input and is electrically connected on the output side via a branch in each case to the power outputs in order to supply these with electrical current from the voltage supply, - a switch element in each of the branches, - a control and/or regulation unit, which is so configured as to control and/or regulate the switching state of the switch elements as a function of reference values for a heating power of the heating elements, - a communication unit, which is so configured as to receive reference values intended for the power module via the first communication interface and to transfer these to the control and/or regulation unit, and to forward reference values received via the first communication interface and not intended for the power module to the second communication interface.