The VFE heat storage unit is equipped with an integrated room temperature and charging controller. It is ideal for retrofitting existing systems, being backward compatible thanks to the universal charging controller that can process AC and DC signals. The capacitive display with proximity function only activates when in use, ensuring ease of handling. It features a sophisticated operating concept for every target group. The room temperature controller offers settings for daily and weekly programs for comfort and setback times of the room temperature, as well as smart window detection. The improved thermal insulation of approximately 10% compared to older devices reduces heat losses and prevents overheating of the room during internal heat gains. The target charging level for the 8-hour charging model is calculated at the factory with pre-assembled radiators. The heat storage unit can be combined with standard central charging controls thanks to its integrated electronic ACDC charging controller and adjustable ED signal options for AC controls. Heat is released through the internal room temperature controller, and an external room temperature controller can also be connected. The control voltage signal can be either DC 0.91–1.43 or AC 230 V. The integrated self-learning charging automation determines the target charging level in automatic mode based on room temperature. The heat storage unit is suitable for systems without central charging control. Its modern, appealing design allows for harmonious integration into the room. The powder-coated steel sheet housing is traffic white in color, similar to RAL 9016. Delivery is as a kit, consisting of a housing with radiators and stones. VFE 60 K.