HMG is an outdoor modular system with reversible inverter heat pumps for producing hot and chilled water. The modularity may be homogeneous or sequential, allowing the installation of these units to adapt to the real system development requirements. The installed power can be increased over time in a simple and cost effective manner. Designed to meet the plant engineering needs of residential or commercial contexts, or industrial applications. Operation down to -20 °C outside air temperature in winter and up to 52 °C in summer. Produces hot water up to 50 °C.