Part of our guide to Tankless vs Tank Water Heater — The Real Trade-off
The costly water damage is rarely the burst pipe you hear. It is the slow one behind a wall that nobody notices until the floor moves — and by then it is usually a maintenance problem rather than an insured event.
Turn off every tap and appliance that uses water. Read the meter. Wait an hour or two using no water at all. Read it again. Any movement means water is leaving the system somewhere you cannot see.
The signs that arrive first
A bill that rose without explanation. Often the earliest signal, and usually dismissed.
A meter that moves with everything off. The definitive test above.
Warm spots on a floor. Suggests a hot-water line leaking beneath a slab.
Musty smell in one area. Persistent damp behind a surface, frequently before any visible mark.
Staining or bubbling on ceilings or walls, especially below a bathroom.
Water pressure that dropped gradually across the house.
Where they usually start
Flexible supply lines to washing machines, dishwashers and toilets. Toilet fill valves that run intermittently and quietly. Water heater fittings. Pipes inside walls, especially at joints.
Put a few drops of food colouring in the cistern. Do not flush. Come back in fifteen minutes. If colour has reached the bowl, the flapper is passing water — continuously, silently, and often for months before anyone notices.
Why finding it early is a financial question too
Insurance generally distinguishes sudden and accidental escapes from gradual ones. A pipe that bursts is usually covered. Water that seeped for months is frequently excluded as maintenance, along with resulting damage.
That is not insurers being awkward — it is the boundary described in what insurance does not cover. It does mean a leak found in week one and a leak found in month eight can be two entirely different financial outcomes.
Related reading
This is general information — see our disclaimer.
Frequently asked questions
How do I confirm a hidden leak?
Turn off every water-using fixture and appliance, note the meter reading, wait an hour or two without using water, and read it again. Movement means water is escaping somewhere.
Does home insurance cover it?
Sudden and accidental escapes are commonly covered. Gradual seepage over time usually is not, which is why finding it early matters financially as well as physically.
Where do hidden leaks usually start?
Supply lines to appliances, toilet fill valves, water heater fittings, and pipes inside walls or under slabs.
Is a running toilet expensive?
It can be one of the largest single sources of wasted water in a house, and it is often silent enough to go unnoticed for months.
Sources
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