Waste Heat Recovery in the industrial sector often requires to upgrade the temperature of the heat fluxes in order to make them useful for the process. Thermochemical Heat Transformer can play a major role as they can provide high temperature lift when compared to alternative technologies. The aim of the presented work is twofold: - to identify suitable working pairs using water as working fluid taking into account three criteria: COP, temperature lift and equilibrium drop (difference of the operating temperature and pressure to their value at equilibrium) - to run a parametric study, thanks to a dynamic 2-salt/2-reactor model, to identify optimal specific heat power as a function of cycle time, working pairs and reactor heat transfer coefficient. For waste heat temperature at 90 °C and a cold source at 30 °C, the CaCl2 /H2O and Ca(NO 3)2 /H2O working pairs were identified as promising. The achieve temperature lift is as high as 90 K for a theoretical COP of 0.42. In dynamic operating, a specific heat power of 325 W/kg was found.