Wood and multi-fuel burning stove

A multi-fuel stove comprising:

• a body supporting an upper insulated primary fuel combustion chamber and lower secondary combustion chamber separated by a grate defining a gap;
• an access door in the body to allow for the addition of fuel to the primary chamber;
• a flue outlet communicating with said primary and secondary combustion chambers, the flue outlet having a mechanism for isolating the flue outlet from the primary combustion chamber;
• the grate comprising a front edge and a rear edge and a solid upper surface for supporting a desired amount of combustible fuel in the primary combustion chamber, the front edge being attached to an interior front wall of the body of the stove, the grate extending back towards an interior rear wall of the body of the stove, and the rear edge being adjacent and spaced from the interior rear wall of the body of the stove to define the gap therebetween and the front edge of the grate being affixed to the front wall of the stove body vertically higher than the rear edge so that the grate slopes downwardly from the front edge towards the back edge;
• a primary inlet path through which a primary air flow is drawn into the stove and passes on a preheating route to the primary combustion chamber, where the primary air flow is drawn down the inside of a glass window incorporated in the access door into the primary combustion chamber;
• a secondary pre-heating inlet path for supplying air to the gap between the grate and the stove, the secondary pre-heating inlet path being defined by a secondary air passage formed between an upper surface and a lower surface in the grate, the secondary air passage communicating with and extending from a first opening in the stove body to a second opening adjacent the gap, bypassing the primary combustion chamber;
• and
• an exhaust path for conveying combustion products from the secondary combustion chamber to the flue outlet also bypassing the primary combustion chamber via a a first and second outlet passages communicating with the secondary combustion chamber extending upwardly between a respective first and second side walls of the stove body and the primary combustion chamber.

A multi fuel stove having a body formed by a top, a bottom, a front, a back and two sides substantially encompassing a two stage insulated combustion chamber communicating with an air intake and flue passages to provide a desired combustion efficiency, the stove comprising:

• an upper primary fuel combustion chamber separated by a sloping grate from a lower secondary combustion chamber, the sloping grate comprising a front edge being attached to an interior front wall of the body of the stove at a vertically higher position than a rear edge of the grate, the grate having a solid upper surface defining a lower boundary of the upper primary combustion chamber for supporting a desired amount of combustible fuel in the primary combustion chamber;
• a gap defined by the rear edge of the grate positioned adjacent and spaced from the interior rear wall of the body of the stove;
• an access door formed in the body to allow for the addition of fuel to the primary chamber;
• a flue outlet communicating with said primary and secondary combustion chambers, the flue outlet having a mechanism for isolating the flue outlet from the primary combustion chamber;
• a primary air inlet formed adjacent the top of the body through which a primary air flow is drawn into the stove along a preheating route to the primary combustion chamber, the preheating route passing the primary air flow across a surface heated by an outgoing heated air flow and down the inside of a glass window incorporated in the access door to the primary combustion chamber;
• a secondary pre-heating inlet path for supplying air to the gap between the grate and the back of the stove, the secondary pre-heating inlet path being defined by a secondary air passage formed between an upper surface and a lower surface in the sloping grate, the secondary air passage communicating with and extending from a second air inlet in the stove body to a second opening adjacent the gap, bypassing the primary combustion chamber;
• and
• an exhaust path for conveying combustion products from the secondary combustion chamber to the flue outlet also bypassing the primary combustion chamber via a a first and second outlet passages communicating with the secondary combustion chamber extending upwardly between a respective first and second side walls of the stove body and the primary combustion chamber.