The ESR31 is a multi-purpose differential controller. The graphical display of ESR31 simplifies program selection and shows the position of the sensors in the hydraulic diagram. Additional information can be read in via the DL bus. The interna;l heat quantity counter allows calculation of the yield (thermal energy). Programming is made easy selecting from the solar and heating system templates and then controller allows cusomisation of settings.
Link to controller manual.
Link to beginners guide.