Thermo-chemical Storages, now in R&D phase, are seen as promising solution to boost renewable energy in space heating, especially solar thermal heating. The main question of the thesis was if a business model for energy contracting for heat supply can be developed, that will address especially the risks coming from the new technology of TCS and the initial investment requirements for the TCS System. A Business Model Canvas was developed based on the customer segment of public office space. The economic validation was done by assessing a target price for the TCS system in a case study for a primary school. The Contracting Business Model with guaranteed results and costs for the customer would allow to introduce this new technology to the market. The set-up of the Energy Service Company, e.g. due to size or partnering will have to create sufficient customers trust, so that they will accept the installation of a heating system based on a fully new technology. From economic point of view Total Cost of Ownership/Life Cycle Cost have to be assessed to allow for relevant investment in the storage system. Public sector, driven by global and European treaties, adapts more and more sustainable approaches for new buildings and building stock. Contracting Business Models, reducing the initial investment needs for the customer, are a feasible instrument to introduce solar thermal energy in combination with TCS as 100% renewable and emission free heating system to the public building market.