Solid Fuel Boiler Assembly

A boiler assembly comprising:

• a primary combustion chamber enclosed by surrounding walls and being arranged to receive a solid fuel for combustion therein;
• a primary blower;
• a primary combustion air passage arranged to deliver primary combustion air to the primary combustion chamber from the primary blower;
• a primary air control arranged to control air flow through the primary combustion air passage from the primary blower to the primary combustion chamber;
• a secondary combustion chamber enclosed by surrounding walls below the primary combustion chamber;
• a combustion passage communicating between a bottom end of the primary combustion chamber and a top end of the secondary combustion chamber therebelow;
• a secondary blower;
• a secondary combustion air passage arranged to deliver secondary combustion air to the secondary combustion chamber from the secondary blower;
• a secondary air control arranged to control air flow through the secondary combustion air passage from the secondary blower to the secondary combustion chamber;
• a boiler chamber arranged to receive fluid to be heated therein;
• a heat exchanger passage communicating through the boiler chamber so as to be arranged to exchange heat with fluid in the boiler chamber;
• and
• an exhaust passage communicating from the secondary combustion chamber to the heat exchanger passage;
• the primary combustion chamber, the secondary combustion chamber and the boiler chamber being supported in a common main housing;
• and
• the primary and secondary air controls each comprising a respective control housing supported externally on the main housing and being coupled to the respective combustion air passages such that the control housings are readily releasable from the main housing and the respective combustion air passages.

A boiler assembly comprising:

• a primary combustion chamber enclosed by surrounding walls and being arranged to receive a solid fuel for combustion therein;
• a primary blower;
• a primary combustion air passage arranged to deliver primary combustion air to the primary combustion chamber from the primary blower;
• a primary air control arranged to control air flow through the primary combustion air passage from the primary blower to the primary combustion chamber;
• a secondary combustion chamber enclosed by surrounding walls below the primary combustion chamber;
• a combustion passage communicating between a bottom end of the primary combustion chamber and a top end of the secondary combustion chamber therebelow;
• a secondary blower;
• a secondary combustion air passage arranged to deliver secondary combustion air to the secondary combustion chamber from the secondary blower;
• a secondary air control arranged to control air flow through the secondary combustion air passage from the secondary blower to the secondary combustion chamber;
• a boiler chamber arranged to receive fluid to be heated therein;
• a heat exchanger passage communicating through the boiler chamber so as to be arranged to exchange heat with fluid in the boiler chamber;
• and
• an exhaust passage communicating from the secondary combustion chamber to the heat exchanger passage;
• the combustion passage being in communication with the secondary combustion chamber at a location partway in between communication of the secondary combustion chamber with the secondary combustion air passage and with the exhaust passage.