US973541A - Water-tube boiler. - Google Patents

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US1313542A - Boiler tube and sheet joint. - Google Patents

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US1613701A - Treatment of boiler water - Google Patents

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US1393741A - Boiler - Google Patents

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Condensing boiler - Wikipedia

Condensing boilers are water heaters fueled by gas or oil. They achieve high efficiency (typically greater than 90% on the higher heating value) by condensing water vapour in the exhaust gases and so recovering its latent heat of vaporisation, which would otherwise have been wasted.This condensed vapour leaves the system in liquid form, via a drain.

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US1493245A - Boiler-tube protector - Google Patents

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