Boiler with a tubular heating-gas flue

摘要

A tubular heating-gas flue with an inner shell (1) and an outer shell (2) arranged at a distance therefrom has, in the interspace, an inserted material consisting of a wound body with windings (3) running at a distance from one another. By varying the distance over the length of the heating-gas flue, a defined heat transmission can be obtained. <IMAGE>