Abstract: For a heating apparatus of the tiled stove-type having a return chamber section, a stove section providing a hearth, and a foot section, blocks for erecting the sections of the heating apparatus include blocks for the stove section having cut-out portions to provide a vertical central up flue gas passage extending from the hearth, two vertical down flue gas passages situated outside the central passage and two further vertical up flue gas passages also situated outside the central passage, blocks for the return chamber section having cut-out portions providing a return chamber connecting the upper ends of the central up flue gas passage and the two down flue gas passages for returning flue gasses to the stove section, the two down flue gas passages and the two further up flue gas passages being interconnected at their lower ends, and blocks providing flue gas passages for leading flue gasses out to a chimney stack.