A tool for installing a heating wire in a floor substrate of the type having receiving means opened toward a surface thereof to receive a heating wire comprises a support with a handle portion to be manually handled by a user. A contact surface is related to the support, the contact surface adapted to contact the floor or floor substrate during displacement of the tool along the floor substrate. An interface is between the handle portion and a heating wire. The interface is adapted to contact the heating wire such that a given pressure applied on the handle portion by the user during the displacement of the tool along the floor substrate is converted by the interface into local engagement of the heating wire in at least one of the receiving means. A method for installing the heating wire using the tool is also provided.