The Modulating Gasvalve System functions optically through a glass or ceramic gas-operated touch-control hob unit. After activation, the touch control permits independent operation of a chosen burner. The plus button affords ignition at full rate; touching the minus button gives ignition at half rate. The gas rate of each burner can be controlled by the plus or minus buttons (optionally 14 or 20 steps), each step being confirmed both optically by an LED indicator and acoustically.
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