Hot Water Slab Leak Detection & Repair

Is it a hot water slab leak?

Most homes in the Inland Empire are built on a concrete slab, with the water lines running underneath. When a hot water line leaks under the slab, the first thing many people notice is the water heater, not the leak. Common signs:

A warm or hot spot on the floor, often on tile or hardwood, sometimes in a line along the pipe’s path
The water heater runs all the time or you hear it refilling when nobody is using hot water
A gas or electric bill that jumps for no clear reason
The sound of running water when every faucet is off
A water bill that keeps climbing with no leak you can see
Damp carpet, warped flooring, stained baseboards or a musty smell
Low hot water pressure at the faucets

A quick check you can do

Turn off every faucet, shower, sprinkler and appliance that uses water.
Look at your water meter. If the dial or leak indicator is still moving, water is leaking somewhere.
Close the cold-water valve on top of the water heater. If the meter stops, the leak is most likely on the hot side.
Walk the floors barefoot and feel for warm spots.

Text us a short video of the meter and a photo of any warm or damp spot. It helps us come prepared.

Leak getting worse? Close the cold-water valve on top of the water heater. That stops water to the hot lines while you keep cold water in the house. Then set a gas water heater to VACATION or PILOT, or switch off an electric water heater’s breaker, and call us.

Why hot water lines leak under the slab

Hot water lines leak far more often than cold ones. Every time the water heats and cools, copper pipe expands and contracts and rubs against the concrete and gravel around it. Over the years that wear, plus high water pressure and aging pipe, opens pinhole leaks. Many homes here from the 1970s through the 1990s have copper lines under the slab that are reaching that age now.

How we find it: electronic leak detection

We don’t guess and we don’t start breaking concrete to look. We pressure test the lines to confirm which one is leaking, then use electronic leak detection equipment to listen through the slab and pinpoint where the leak is. You get a clear answer: which line, where it is, and what it will take to fix.

Repair options

There’s more than one way to fix a slab leak. We explain each option for your house and tell you honestly which one makes sense.

Repair	What it is	Best when
Reroute	We leave the leaking line under the slab and run a new hot water line through the walls or attic. We repair the drywall afterward so the walls are ready for paint.	The most common fix for hot water lines. No breaking up floors.
Spot repair through the slab	We open the floor right over the leak, repair the pipe, and patch the concrete.	One leak in otherwise good pipe, in a spot that’s easy to reach.
Whole-house repipe	We replace the home’s water supply lines with new pipe run through the walls and attic, with drywall repair included.	More than one leak, or older pipe throughout the house that will keep failing.

Start to finish, one company

Text or call usTell us what you’re seeing. We can usually come out the same day.
We find the leakPressure testing and electronic leak detection to pinpoint it.
We explain your optionsReroute, spot repair or repipe, with a clear price before we start.
We make the repairOur own licensed plumbers do the work, pressure test the new lines and repair the drywall.
We help with insurancePhotos, leak detection findings and itemized invoices for your claim.

Help with your insurance claim

Homeowners policies differ. Some cover the cost to reach the pipe and repair water damage but not the pipe itself, and some cover more. We don’t decide coverage, but we give you and your adjuster what they need: where the leak was found, photos before and after, and an itemized invoice that separates the leak detection, access, repair and drywall repair.

Hot water is what we do

Hot Water Heater Factory is a Sweetwater Plumbing company. We focus on hot water: water heaters, the lines that carry hot water through your home, and the leaks that come with them, in Montclair and the nearby cities listed below. If a warm floor or a water heater that never stops brought you here, you’re in the right place.

Not sure it’s a slab leak? See common water heater problems. If the water is coming from the tank itself, see tank water heater replacement.

Hot water slab leak repair near you:

Questions we hear a lot

How do I know if a slab leak is on the hot or cold line?

Warm spots on the floor and a water heater that runs constantly point to the hot side. A quick check: with all water off, close the cold-water valve on top of the water heater. If the water meter stops moving, the leak is most likely on the hot side. Our leak detection confirms it.

Is a reroute better than fixing the leak through the slab?

For hot water lines, a reroute is often the better choice. It avoids breaking up floors, and it replaces the section of pipe that’s been wearing against the concrete. A spot repair can make sense for a single leak in otherwise good pipe. We explain both for your house.

Does homeowners insurance cover a slab leak?

It depends on your policy. Many policies cover the cost to access the pipe and repair water damage but not the pipe itself. We provide the photos, leak detection findings and itemized invoice your adjuster will ask for.

Will you have to break up my floors?

Usually not. Most hot water slab leaks are fixed with a reroute through the walls or attic. If a spot repair through the slab is the better option, we open only the area over the leak.

Do you repair the drywall?

Yes. Drywall repair is included on every job that needs it. After a reroute or repipe, we repair the wall openings so they’re ready for paint.

How long does a reroute take?

Most hot water reroutes take a day or two, depending on the house and how far the new line has to run.