Chemisorption is a promising solution for long-term heat storage with a high energy density. Considering application to buildings, heat storage can be used for space heating and domestic hot water production. In the present work, the specification requirements of a heat storage system for buildings are given. A review on chemical heat storage materials is carried out and reactor development is discussed. Some future research topics are presented in the conclusions. (C) 2015 Elsevier B.V. All rights reserved.