Akvaterm - the essence of heating Hot water is a basic prerequisite for practical and comfortable living. An essential feature of modern and energy-saving heating technologies for multi-storey buildings and terraced houses is the accumulation of heat and its transfer through water. Thanks to water’s high heat retention capacity, the connection of an Akvaterm accumulator tank to the heating system significantly raises the utilisation efficiency, lowers energy costs and reduced environmental emissions. >> Made to measure