Boiler Leaking Water

When this becomes an emergency

• There's a drip you can hear hitting the floor drain even when nobody is running water.
• A white crusty deposit has built up on a fitting or along a seam.
• The makeup water valve keeps cycling to hold pressure it used to hold on its own.
• The floor near the unit stays damp between visits to the mechanical room.

What a pro does

The first job is telling a leak from condensation. Cold return water on a boiler that's been short-cycling will sweat and drip in a way that looks convincing, and a tech separates the two by checking supply and return temperatures before chasing fittings. Real leaks come from a handful of places: pump seals, the relief valve, the backflow assembly, or a hairline crack in a section that only weeps once the iron is hot. Mineral crust marks the spot where water has been escaping and evaporating for a while, so it's a useful map. If water is anywhere near the burner or the control box, power off is the right first move.

Frequently asked questions

Boiler Leaking Water?

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