Problem: it is possible to cope with the test of the fuel gas for testing without losing the ignition conditions corresponding to the fuel gas for the market, and to avoid the usability.In the hot water supply 1Controller 32Ignition conditionsThe first ignition condition and the number of fuel gas to the burner unit 4 and the number of revolutions of the fan 16 corresponding to the market gas are presetA preset second ignition condition is set so that the fuel gas quantity and the number of revolutions are less than the first ignition conditions corresponding to the test gas having different market gases and components.Controller 32At the start of hot water supplyBy igniter 25Ignition control is performed according to the first ignition conditionIf ignition control of the burner unit 4 cannot be confirmed by the frame rod 26 even if ignition control in the first ignition condition is executedIgnition control is executed in accordance with the second ignition condition.Diagram
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