How hot water lines can wear
Hot water lines expand and contract as hot water flows through them. Where a pipe passes through or rests against concrete, that movement can wear a small hole over time.
How a plumber finds it
A plumber may isolate the hot side and pressure-test it. Common locating tools include thermal cameras, which can show warm water spreading under the floor, and acoustic equipment can help confirm the location.
What to do right now
If you suspect a hot water leak, turn off the cold water supply valve on top of your water heater. This can stop the heater from refilling the leak while you wait, and limit wasted energy.
What happens when you call
- 1
Call about the warm spot
Describe where the floor feels warm and what else you have noticed.
- 2
Isolate the hot side
A plumber may pressure-test the hot lines on their own to confirm the leak.
- 3
Thermal and acoustic locating
Thermal imaging and listening equipment can help pinpoint the leak under the floor.
- 4
Plan the fix
Ask about your options for a spot repair or rerouting the hot line.