What is the difference between an integrated burner and a separate burner in a heat transfer oil furnace?

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Our factory has two heat transfer oil boilers: one is a heat transfer oil boiler with an integrated burner, with a capacity of 500,000 kcal, and the other is one with a separate burner, having a capacity of 1,200,000 kcal； It has been in use in a split configuration for almost two years, equipped with an Ignis burner EG100; apart from the need to regularly clean the carbon buildup on the flame detector probe, it operates normally ； However, integrated burner heat transfer oil furnaces have many problems; the RS190 burner from Lialu should be used instead ； As follows: 1. In rainy weather or when the air humidity is high, the burner tends to go out and is difficult to restart; it is necessary to replace the flame detector before it can function properly, which is quite troublesome ； 2. It is an integrated unit with a self-check function that runs a self-check every 22 hours. During the self-check, the air valve is set to its minimum position; if any problems arise, it is easy for the furnace to stop operating, and it won’t start working ； Dear sailors, have you encountered such a situation? How do the experts explain it?