Dab. Evosta 2. Energy-saving electronic circulation pump for circulating water in heating and cooling installations in small and medium-sized residential units. Advantages: EVOSTA 2 represents a new range of DAB circulation pumps that combine the robustness of mechanical circulation pumps with the advantages of electronic models. The synchronous permanent magnet motor, the frequency converter, an efficiency index EEI 0,18 Evosta 2, combined with protection level IPX5 and the integrated bleed plug make the new Evosta series one of the best products in its class in terms of efficiency and reliability.