Boiler Leaking Water

When this becomes an emergency

• There's wet concrete under the unit that dries and comes back every day.
• The needle on the pressure gauge sits above where it used to rest.
• The discharge pipe off the relief valve stays damp between cycles.
• Corrosion has bloomed on a joint, a pump body, or the underside of the jacket.

What a pro does

Half the job is deciding whether the water came from the boiler or landed near it. Condensate from a high-efficiency unit, a leaking domestic line running overhead, and a genuine boiler leak all leave the same wet floor, so the first move is drying the area completely and watching where fresh water appears once the system heats up. Real leaks tend to start at circulator seals, at threaded joints that have cycled through years of expansion, and at the relief valve when pressure climbs where it shouldn't. Big swings between a mild afternoon and a hard freeze push a system through more expansion cycles than a steady climate does, and joints notice. Power off and feed valve closed is the safe way to wait.

Frequently asked questions

Boiler Leaking Water?

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