Systems and methods for heating water using biofuel

A biofuel heating system for converting biofuel to heat energy to be delivered to a load, comprising:

• a combustion chamber defining a combustion zone, an under-fire zone, and an over-fire zone, where
• the combustion zone is adapted to receive the biofuel,
• the under-fire zone is below the combustion zone, and
• the over-fire zone is above the combustion zone;
• a plurality of under-fire ports arranged adjacent to the under-fire zone of the combustion chamber;
• a plurality of over-fire ports arranged adjacent to the over-fire zone of the combustion chamber;
• a burn-out chamber;
• a burn-out port arranged to allow fluid to flow out of the over-fire zone of the combustion chamber and into the burn-out chamber;
• a heat exchange chamber;
• a heat exchange port arranged to allow fluid to flow out of the burn-out chamber and into the heat exchange chamber;
• an exhaust port arranged to allow fluid to flow out of the heat exchange chamber,
• a heat exchange system arranged at least partly within the heat exchange chamber, where a working fluid is circulated between the heat exchange system and the load;
• an under-fire damper configurable to inhibit flow of fluid through the under-fire ports;
• an over-fire damper configurable to inhibit flow of fluid through the over-fire ports;
• a fan arranged to cause fluid to flow out of the heat exchange chamber through the exhaust port;
• at least one sensor configured to sense an operating parameter;
• a controller for operating at least one of the fan, the under-fire damper, and the over-fire damper based on the operating parameter such that air flows along a flow path extending from at least one of the under-fire port and the over-fire port, through the combustion chamber, through burn-out port, through the burn-out chamber, through the heat exchange port, through the heat exchange chamber, and out of the exhaust port;
• and
• the heat exchange system transfers heat energy from air flowing through the heat exchange chamber to the working fluid.