Boiler for generating steam and/or for heating water (13) that comprises a metal container (12) provided at least with an aperture (14) to feed the water (13) and an aperture (22) to discharge the water (13) and/or possible limescale (15). The discharge aperture (22) is selectively closable by a cap (24), and the boiler also comprises a heating element (18) associated with the container (12).
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