The diagram shows a domestic hot water (DHW) production system designed for high-elevation multi-storey buildings, in which instantaneous production gas generators arranged in cascade and storage kettles are combined, so as to efficiently manage even peak demand. DHW production is located on the roof of the building, a strategic solution that facilitates maintenance, optimises the use of technical spaces and guarantees good operating conditions.

The hot water distributed to the floors is regulated by an electronic mixer, located at the main distribution point. The presence of a complete recirculation network, with a pump also on the roof, guarantees rapid delivery times and stable temperature throughout the upright column.

Each user detachment is equipped with pressure reducers for hot and cold water, which maintain the stability of the system even in conditions of strong hydraulic difference. However, in order to prevent such devices from hindering the circulation of hot water, the scheme provides for a combined pressure and temperature control unit installed at the surface detachment.

The system guarantees optimal performance, with integrated flow, pressure and temperature control at every point of the network. The electronic mixer also allows anti-Legionella thermal disinfection, while the thermostatic regulators in the recirculation return circuits allow automatic flow balancing, ensuring efficiency and health safety.

This configuration requires an advanced design, especially with regard to the correct dimensioning of the recirculation, the vertical distribution of the DHW (downhill) and the hydraulic management of the network.