Biomass pellet combustion system

A biomass pellet combustion system comprising:

• a primary burn chamber configured to receive pellets from a drop tube of the biomass pellet combustion system;
• a coal burn chamber configured to receive coals from the primary burn chamber;
• and
• a gas burn chamber configured to receive combustible gases from both the primary burn chamber and the coal burn chamber, wherein a secondary combustion process converts secondary combustion air and the combustible gases into exhaust gases in the gas burn chamber, wherein:
• a bottom of the primary burn chamber is formed by a grate;
• primary combustion reduces the size of pellets in the primary burn chamber by mixing primary combustion air with the pellets until the pellets become coals and drop through the grate into the coal burn chamber;
• primary combustion mixes primary combustion air with the coals in the coal burn chamber converting the coals into ash and combustible gases within the coal burn chamber;
• primary combustion air and secondary combustion air enter the system through a common inlet;
• and
• the system further comprises a control valve configured to determine a total amount of primary and secondary combustion air entering the system through the common inlet.