Water Leaking From the Bottom of the Boiler

Water under the boiler always deserves a look.

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Water leaking from the underside of a combi boiler can come from the condensate trap, pump or valve seals, internal pipework, or — more seriously — a corroded heat exchanger. Because water and electrics don't mix, it's worth turning the boiler off and calling promptly.

Don't open the casing yourself; that exposes live electrics and gas components.

Possible sources

Condensate trap or pipe
Pump or valve seals
Internal pipe fittings
Pressure relief valve discharge
Corroded heat exchanger (serious)

Smell gas or suspect carbon monoxide? Leave now.

If you smell gas, hear hissing, or your CO alarm sounds, leave the building immediately and call your gas utility's emergency line from outside. Do not operate switches or relight the appliance. Once you are safe, call us for a licensed repair.

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