Domestic hot water for showers in large facilities (Hotels, leisure facilities, etc.) is one of the most important services offered to customers, but it is often deficient due to the lack of hot water supply in peak hours and to the excessive energy consumption.Our method of Hot Water production has been designed to obtain higher efficiency, which results in a greater saving of energy, and therefore financial benefits. The use of night rate electricity is paid off with the energy savings of only a short period of time.