High turn-down modulating burner

A high turn-down burner adapted to receive a fuel flow for combustion, said burner comprising:

• (a) an outer housing comprising a central axis, a side wall having a top edge and a bottom edge, a plurality of apertures disposed on said side wall, a top wall adjoining said side wall at said top edge and a bottom wall adjoining said side wall at said bottom edge;
• (b) an inner housing comprising a central axis, a side wall, a plurality of apertures disposed on said side wall, wherein said inner housing is configured to be coaxially inserted in said housing such that said inner housing is coaxially rotatable with respect to said outer housing;
• and
• (c) an actuator adapted to harness and convert the power exerted by the fuel flow to a rotation of said inner housing with respect to said outer housing,
• wherein the alignment of said plurality of apertures of said inner housing and said plurality of apertures of said outer housing are configured such that said rotation is adapted to modify an effective combustion area of said burner which is defined by the amount of overlap between said plurality of apertures of said inner housing and said plurality of apertures of said outer housing.