Patent ID: 8235708

Claim:
A heater for burning one of at least two different fuels to create heat comprising: an elongate tubular combustion chamber for receiving a fuel to be burned at the combustion chamber; a first combustion chamber nozzle outlet to direct a first fuel to the combustion chamber, the first combustion chamber nozzle outlet sized to increase the velocity of the first fuel as it exits the first combustion chamber nozzle outlet; a second combustion chamber nozzle outlet to direct a second fuel, different from the first, to the combustion chamber, the second combustion chamber nozzle outlet sized to increase the velocity of the second fuel as it exits the second combustion chamber nozzle outlet, wherein a flow through area of the second combustion chamber nozzle outlet is larger than a flow through area of the first combustion chamber nozzle outlet and the first combustion chamber nozzle outlet is positioned upstream of the second combustion chamber nozzle outlet such that flow through the first combustion chamber nozzle outlet also passes through the second combustion chamber nozzle outlet; and a fluid flow controller having a first position configured to direct the first fuel to the elongate tubular combustion chamber through the first combustion chamber nozzle outlet and then through the larger second combustion chamber nozzle outlet, and a second position configured to direct the second fuel to the elongate tubular combustion chamber through the second combustion chamber nozzle outlet but not through the first combustion chamber nozzle outlet.