page_title: Thermic siphon
hierarchical_section_title: Thermic siphon
caption_attribution_description: English: Official photograph of the Leader boiler under construction at Brighton works. Taken in early 1949 by British Railways, a nationalised (UK government) concern.
context_page_description: Thermic siphons are heat-exchanging elements in the firebox or combustion chamber of some steam boiler and steam locomotive designs. As they are directly exposed to the radiant heat of combustion, they have a high evaporative capacity relative to their size. By arranging them near-vertically, they also have good water circulation by means of the thermosyphon effect.
context_section_description: Thermic siphons (alt. thermic syphons) are heat-exchanging elements in the firebox or combustion chamber of some steam boiler and steam locomotive designs. As they are directly exposed to the radiant heat of combustion, they have a high evaporative capacity relative to their size. By arranging them near-vertically, they also have good water circulation by means of the thermosyphon effect.
caption: Thermic syphons in the boiler of Bulleid's Leader class. They are particularly visible in the Leader boiler, as the firebox is dry-walled, rather than water-jacketed.
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