Boiler Leaking Water

When this becomes an emergency

• There's a damp ring or a fresh puddle spreading under the jacket of the unit.
• You keep topping the system up with make-up water and the level still falls.
• Steam or a warm wet smell rises off the piping while the burner runs.
• Paint is blistering or the floor under the base has gone soft and chalky.

What a pro does

The first job is figuring out whether the water is escaping the system or condensing on it. Those look identical on a basement floor in a damp lakefront winter, and plenty of homeowners have replaced a perfectly serviceable unit over what turned out to be flue condensate dripping down a cold chimney breach. A tech dries everything, runs a firing cycle, and watches where the wet returns first. From there it's a question of which joint gave up: a near-boiler nipple, a seeping section seam on old iron, a tapping that's been slowly weeping behind the jacket where nobody could see it. Make-up water is the quiet killer in these houses, because every gallon of fresh feed brings dissolved oxygen and minerals that grind away at the sections from inside, so an automatic feeder masking a small leak does more long-term damage than the leak itself. Killing power at the switch and closing the feed line buys time until someone can look.

Frequently asked questions

Boiler Leaking Water?

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