Users can now choose between the Vitocal 250-A with the best efficiency and maximum convenience or the more economical Vitocal 150-A with an eye on the wallet. Regardless of the Out Door Unit (ODU), the new components always fit together with the In Door Unit (IDU). This high level of flexibility means significantly shorter installation times for tradespeople and users only pay for what they actually need for their heating system. The new hydraulic interface also saves valuable time during installation.