Modular indirect hot water tank integrates seamlessly with the Viessmann boiler systems and air-to-water heat pumps;System solution with heating water buffer tank, allows easy installation with 360 Degree rotation;Tank coil extends to the bottom of tank, guaranteeing even water temperatures at all times;Uniform design of tank and Vitocal 100-AW indoor unit;The tank stays hygienic and requires only minimum service;Modest space requirement of 6 ft² (0.5 m²)