What is a common sign of an inefficient burner operation?

A common sign of inefficient burner operation is high stack temperature readings. When a burner is not operating efficiently, it tends to waste fuel, which leads to increased temperatures in the stack. This higher stack temperature indicates that more energy is being expelled through the flue gases rather than being utilized to heat the water or produce steam effectively.

In contrast, fluctuating water temperature may suggest issues with the heating system, but it does not directly indicate burner inefficiency. Consistent steam pressure is often a sign of stable operations, and regular function without interruptions typically reflects proper burner performance. Thus, high stack temperature readings serve as a clear indicator of inefficiency.