Boiler Leaking Water
Water pooling under the boiler, staining on the wall below it, or pressure that drops every day..
Water pooling under the boiler, staining on the wall below it, or pressure that drops every day.
What is actually going on
Water pooling under the boiler, staining on the wall below it, or pressure that drops every day.
The realistic causes, in order
A failed pump head gasket or a weeping auto air vent, both common and both repairable in place A pressure relief valve passing because the expansion vessel has lost its charge, discharging through the outside pipe Corrosion pinholes in the primary heat exchanger, which is the serious version of this fault
What we test on site
Where the water is actually coming from with the case off — drips travel before they land Expansion vessel charge pressure against the manufacturer's figure, with the system drained down Whether the outside discharge pipe is wet, which separates a relief-valve fault from an internal leak
Get a boiler leaking water diagnosed properly
Vessel and gasket leaks are routine repairs. A leaking primary heat exchanger is the one case where replacement often makes more financial sense.
Questions we get asked
What causes a boiler leaking water on a gas boiler?
A failed pump head gasket or a weeping auto air vent, both common and both repairable in place
What normally puts a boiler leaking water right?
Vessel and gasket leaks are routine repairs. A leaking primary heat exchanger is the one case where replacement often makes more financial sense.
Is it safe to keep using the system with a boiler leaking water?
Water and mains electricity in the same case is a genuine hazard. Isolate the boiler electrically if water is visibly running, and don't run it until it's been inspected.