| 摘要 |
A gas heater has a burner including burner blocks disposed in confronting relation to an upper panel of glass, an air supply/discharge fan for supplying combustion air to the burner and discharging combustion exhaust gases from the burner through a porous body, and a branch air supply pipe opening/closing valve for selectively supplying and stopping supplying a mixture of a fuel gas and air to one of the burner blocks. When a capacity selector switch is shifted to a "high capacity" position, a controller opens a main gas valve and the branch air supply pipe opening/closing valve to burn the fuel gas on both the burner blocks, providing an effective heating area of a larger diameter on the upper panel. When the capacity selector switch is shifted to a "low capacity" position, the controller opens the main gas valve and closes the branch air supply pipe opening/closing valve to burn the fuel gas on one of the burner blocks only, providing an effective heating area of a smaller diameter on the upper panel.
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