Hydro-pneumatic kettle for 3 or 4 muffles cooking. The pressure boiler is made of nickel-plated brass. Working temperature adjustable from 0 °C to 120 °C. Has a timer adjustable from 0 to 30 minutes. Has built-in a sonorous alarm for the control of the time and temperature. Automatic air regulation from 2.5 to 4 bars. Manual discharge of liquids on a 20 liter container. Includes a clamp for 3 muffles and a plastic can with the special hose to discharge the water.