If water level is rising instead of lowering on oil heater unit, is there a leak? Could something worse happen. Oil man had to drain water to lower water, and said to watch it to make sure it doesn't rise again. Any answers much appreciated ☺️


The two most common causes are:

  1. Defective auto-fill valve (most common in steam systems).

    The fill valve is similar to a toilet fill valve where a float ball raises or lowers with the level of the water maintaining correct levels.

  2. Leaking heating coil.

    Also, a leaking coil within a tank-less or indirect domestic water heater. The coil sits in the furnace and if it leaks, municipal water collects within the furnace, causing an overfilled condition.

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  • Thank you☺️ Your explanation was very easy to understand. Enjoy your day and family.💁🏻 – user44753 Oct 20 '15 at 14:08

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