Electric fluid flow heater with heating elements stabilization fins

An electric heater to heat a flow of a fluid comprising:

• at least one axially elongate jacket element defining an axially elongate jacket block having first and second lengthwise ends;
• a plurality of longitudinal bores or channels extending internally through the jacket block and being open at each of the respective first and second lengthwise ends each of the bores or channels defined by an internal facing surface of the at least one jacket element;
• and
• at least one heating element extending axially through the bores or channels and having respective bent axial end sections such that the at least one heating element emerges from and returns into adjacent or neighbouring bores or channels at one or both the respective first and second lengthwise ends, the at least one heating element and the jacket block forming a heating assembly,
• wherein at least three fins project radially inward from the at least one jacket element towards the at least one heating element within each of the bores or channels.