The chapter is concerned with the model of multichannel diffusion of hydrogen in a solid. The model is developed for analysis of diffusion of small, so-called natural, hydrogen concentrations, describes experiments for the model verification, and presents data on the hydrogen binding energies in a solid obtained by identifying the model parameters by means of the experimental data. A critical analysis of some disadvantages of the widely known method of thermo-desorption spectra is provided. The energy spectra of hydrogen obtained by the latter method and the multichannel diffusion model are compared and discussed. 15 years ago we first introduced Dmitry Indeitsev to the idea of applying the model of multichannel diffusion to determine the hydrogen binding energy in a solid. He enthusiastically supported our activity, both by discussing the results and participating in projects by Russian Foundation for Basic Research. Our experimental results served as a basis for the two-continuum model proposed by him. The authors express deep gratitude to him for the extremely useful and friendly participation in the development of our ideas.