An apparatus for conducting heat, including a substrate for receiving one or more electric components and a thermal substance circulation system. The substrate includes a first interface for receiving a first part of the thermal substance circulation system and a second interface for receiving a second part of the thermal substance circulation system such that the substrate is, when in use, in contact with the thermal substance of the circulation system between the first and the second interface. The substrate is heat conductive for transferring heat between the one or more electric components and the thermal substance of the circulation system.