In order to ensure that an inhaler having a basic body accommodating a liquid reaction chamber, a lid for the gas-tight closure at least of the liquid reaction chamber and a connection for a flexible line leading to a breathing mask can be used not only for inhalation of oxygen but also for inhalation of steam with essential oils, an electrical heating device (13) having a socket for a plug (17) of an electrical lead (18) is arranged in the liquid reaction container (5) and the basic body (1) is provided with a passage opening (44) in front of the socket which can be covered with a closure element (22), the lid (2) being placeable onto the basic body (1) in three positions and having a blocking shoulder (25) which is locked in the closed position in the first position of the closure element (22), and in the second position is released for opening. <IMAGE>
