HEATING APPARATUS

摘要

A heating apparatus, e.g. a vent−free gas−fired heater, has a housing (10), a flame−resistant bed (30) shaped to resemble fuel and having apertures (44) extending from its undersurface (46) to its upper surface (40), a bed viewing aperture (24) in the housing, a fuel burner (48) in a combustion chamber (50) within the housing beneath the bed (30) and an air inlet (52) to allow the ingress of air to the burner (48). The flame−resistant bed (30) is mounted within the housing (10) to prevent the flow of gas around its periphery from its undersurface (46) to its upper surface (40), such that the combustion chamber (50) communicates with the upper surface (40) only via the apertures (44) in the flame−resistant bed (30). This ensures that all of the gases (whether combustion gases or excess air) are forced to pass through the apertures (44) in the bed (30) and assists in obtaining the optimum fuel/air ratio. The exhaust gases also preferably pass over a catalyst (66) before being discharged.