Abstract: A solid fuel burner having a housing with runners mounted inside its sidewalls and vertical rods passing upwardly through the runners which support two frames each having a shaker-grid opening therethrough with a shaker grid rockably supported therein, the shaker grids being capable of separate shaking so that one grid can support a coal fire and the other support a wood fire, and the frames having air slots therethrough offset from the grid openings with plugs for selectively closing them, and sideliner plates restable on the frames and leaning outwardly against the vertical rods between the grids and the sidewalls.