Solicitudes De Calefacción Ventilación Aire Acondicionado / Caldera De Calefacción / Jordania

I really want to buy an Electric Hot Water Boiler for Central Heating and Domestic Hot Water in my House. HOUSE SPECIFICATIONS: (380 Sq meter) ( 1140 cubic m) • Width: 19 m • Length: 20 m • Height: 3 m I have 3 phase 380 Volts 50 Hz: ▪ Line Voltage: 380 Volts ▪ Phase Voltage: 220 Volts Would you please advise of the following: 1. The most suitable Boiler Type for my house 2. How to Calculate the Size of the