Down-draft heating device

A heating device comprising;

• a primary burn chamber;
• a secondary burn chamber;
• a solid fuel support structure separating said primary burn chamber and said secondary burn chamber, said solid fuel support structure being operable to support a solid fuel for burning in said primary burn chamber, to pass air from said secondary burn chamber to said primary burn chamber and to pass gas and particulates from said primary burn chamber to said secondary burn chamber;
• an exhaust port operable to exhaust gases;
• a cooling chamber disposed between said secondary burn chamber and said exhaust port, said cooling chamber bung operable to extract heat from gases from said secondary burn chamber;
• an first port operable to supply external air to said primary burn chamber;
• a second port operable to supply external air to said secondary burn chamber;
• and
• a gas flow controller operable to block said exhaust port in a downdraft mode thus preventing exhaust gases from exhausting, through said exhaust port and operable to unblock said exhaust port in a updraft mode such that exhaust gases exhaust through said exhaust port.