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A flexible digester temperature enables holistic storage of surplus heat and minimization of heat deficits on water resource recovery facilities (WRRFs). Heat‐saving potentials, performance as heat storage, and emissions of CO2 are considered in four scenarios with increasing flexibility of digester temperature for a model WRRF with 500 000 PE (population equivalent). In comparison to a digester temperature at 37 °C all year, the scenario with seasonal variation of average digester temperatures between 32.5 and 43.6 °C has the greatest annual heat‐saving potential and increase of stored heat. Further, the ranges of digester temperatures indicate a great performance as heat storage. [ABSTRACT FROM AUTHOR]