Importance

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Abstract

A heating device includes: a primary burn chamber; a secondary burn chamber; a solid fuel support structure separating the primary burn chamber and the secondary burn chamber, the fuel support structure being operable to support a solid fuel for burning in the primary burn chamber, to pass air from the secondary burn chamber to the primary burn chamber and to pass gas and particulates from the primary burn chamber to the secondary burn chamber; an exhaust port operable to exhaust air; a cooling chamber disposed between the secondary burn chamber and the exhaust port, the cooling chamber being operable to extract heat from gases from the secondary burn chamber; a first port operable to supply external air to the primary burn chamber; a second port operable to supply external air to the secondary burn chamber; and a gas flow controller.

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First Claim