Automatic variable-speed pressure booster set for water supply. Automatic pumping of clean water for domestic, industrial, agricultural and garden purposes. Variable-speed operation to maintain the constant pressure and flow required by an apartment, building or facility at any given time. Suitable for applications such as sprinkler or drip irrigation, water transfer or household booster. The set is quiet and has an adjustable working pressure. The pump set includes the suction manifold and pressure vessels