A method is presented for solving problems of one‐dimensional heat flow in regions with plane, spherical, or cylindrical boundaries. It is based on the physical concept of a uniform continuous‐source distribution on the boundary, whose strength varies with time in such a way as to meet the prescribed boundary condition. Examples of the method are given, including the solution for the temperature in a half‐space with an initial steady gradient of temperature and the boundary condition (∂T/∂x) −w(∂T/∂t) −hT= −h&thgr;.