Heating body

A heater comprising:

• several heat tubes filled with a working medium, extending preferably parallel or parallel, and each having a first end and a second end, and
• a heat source thermally coupled to the first or second ends of the heat tubes,
• wherein the first ends of the heat tubes are open and fluidically connected to a first transverse connection tube,
• wherein the second ends of the heat tubes are open and fluidically connected to a second transverse connection tube,
• wherein the heat tubes and the transverse connection tubes form a common cavity filled with the working medium,
• wherein the first transverse connection tube is thermally coupled to the heat source to receive heat from the heat source,
• wherein the heat source is a heating tube through which a gaseous or liquid heating medium can flow, the heating tube being arranged coaxially in the first transverse connection tube along a longitudinal axis and being surrounded by the working medium, and
• wherein connectors of the heating tube are connected to the first transverse connection tube at an end face thereof, in a pressure-tight and fluid-tight manner;
• the heater has a connection system with a flow connection and a return connection, the flow connection being connected via a first bypass tube to a control valve which is coupled to a connector projecting at an end face from the second transverse connection tube;
• and a second bypass tube extends from the control valve preferably parallel to the first bypass tube, is in fluidic connection to the heating tube and is coupled to the return connection.