Water heater leaks
Water heater leak cleanup in Maple Valley, WA
Water heaters tend to fail one of two ways: a slow seep that goes unnoticed for weeks, or a tank that lets go and puts its whole contents on the floor. Either way, here’s what to do.
We’ll help you shut the heater down safely and deal with the water.
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The problem
Where water heaters are, and why that matters
In many houses built around Maple Valley since the 1990s, the water heater sits in the garage, often on a raised platform. In others it’s in a closet inside the house, a laundry room, or a daylight basement utility room. Some older and rural houses have it in the crawl space.
A garage leak can often be handled with a squeegee and a floor drain, until the water runs under the door into the house or along the wall into the adjoining room. A closet or upstairs heater is different: water goes straight into the subfloor, the walls and the ceiling below. A crawl space heater leaks where nobody can see it.
Tank heaters have a limited service life, and the tank itself eventually corrodes. The first signs are often small: rust at the base, a damp platform, a drip from a fitting.
Right now
What to do right now
Stay clear of wet electrics
If water is near outlets or panels, do not enter. Call your utility and emergency services.
Turn off the heat source
For a gas heater, turn the control to “off” or “pilot.” For electric, switch off its breaker. This protects the heater once water stops coming in.
Close the cold water inlet
The valve on the cold supply pipe at the top of the heater stops more water entering the tank. If it won’t turn, close the main.
Don’t drain it yourself unless you’re comfortable
Water in the tank may be very hot. It can wait for the crew or a plumber.
Move things out of the way
Get boxes and stored items away from the water, especially cardboard on a garage floor.
Photograph the heater and the floor
Include the label with the model and date if you can see it, and any visible leak point.
Not sure which valve is the cold inlet? We’ll talk you through it.
Call and We’ll Walk You Through ItWhat fails
Common causes of water heater leaks
Tank failure
Corrosion eventually breaks through the tank lining. It often starts as a seep at the base and can turn into a full release.
Relief valve discharge
The temperature and pressure relief valve opens to protect the tank. A valve that drips constantly or discharges repeatedly should be looked at by a plumber.
Supply connections
Flexible connectors and fittings at the top of the heater can leak, especially after years of heating and cooling.
Drain valve
The valve at the bottom of the tank can drip, particularly after it’s been opened for flushing.
Expansion tanks
Where fitted, expansion tanks and their connections can fail.
Tankless units
On-demand heaters have connections and condensate lines that can leak inside a wall or closet.
What you notice
What people notice first
- Water on the garage floor around the heater, or a damp platform.
- Rust-colored water from hot taps, or rust at the base of the tank.
- A popping or rumbling sound from the tank.
- Lukewarm water or running out of hot water sooner than usual.
- Water under the door from the garage into the house.
- A water stain on the ceiling below a closet heater.
Location matters
What to check, depending on where your heater is
Garage
Check the bottom of the wall shared with the house, which is often drywall on a wood plate sitting right on the slab. Look under the door into the house and along any stored boxes. A garage floor drain, if there is one, should be clear.
Closet or laundry room
Check the flooring around the closet, the baseboards of adjoining rooms and, if upstairs, the ceiling below. Water from a closet heater goes straight into subfloor, so the room may look drier than it is.
Daylight basement
Check carpet edges in nearby rooms, the bottom of framed walls against the foundation, and the floor drain. A heater leak on a slab can be confused with seepage, so note whether the water is warm.
Crawl space
Look through the hatch for water on the vapor barrier near the heater and damp insulation overhead. Crawl space heaters are more common in older and rural houses, and a slow leak can run for a long time unseen.
Step by step
How water heater leak cleanup is done
Making it safe to work
The crew confirms the heater is off and isolated, and advises on a plumber for repair or replacement.
Water removal
Standing water is squeegeed, extracted or pumped from the garage, closet, basement or crawl space.
Checking adjoining rooms
Garage walls shared with the house, and floors and ceilings next to a closet heater, are checked with moisture meters.
Removing wet materials
Wet drywall on the garage side, baseboards, carpet pad or subfloor are removed where they can’t be dried.
Drying
Dehumidifiers and air movers run until readings are normal.
Repair
Drywall, flooring and finishes are replaced once dry.
The crew prices the job before starting, with no hidden fees.
Call for Upfront PricingTime and cost
What affects time and cost
- Where the heater is, and what’s underneath and beside it.
- Whether the tank seeped slowly or released all at once.
- Whether water went under the door into the house.
- A closet or upstairs location, which means subfloor and ceilings.
- A crawl space location, which means insulation and barrier.
- Repairs to garage walls, flooring and finishes.
Afterward
After the heater is replaced
A drain pan under the new heater, piped to a drain where possible, catches small leaks before they spread. A leak sensor on the floor beside it gives early warning. If your heater is in a closet or upstairs, those two things are worth a great deal.
Knowing the age of your water heater helps you plan. The date is usually on the label or encoded in the serial number.
The crew can document the work performed.
A calm hand for a wet garage, day or night.
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Questions
Water heater leak questions
Turn a gas heater to “off” or “pilot,” or switch off the breaker for an electric one. Then close the cold water inlet valve at the top. If that valve won’t turn, close the main shutoff.
A small drip from a fitting may not be urgent, but it’s worth having looked at. Water at the base of the tank is more concerning, because it can mean the tank itself is failing.
Leaks from fittings, connectors or valves can often be repaired by a plumber. A leak from the tank itself usually means the heater needs replacing.
It may be opening because of high temperature or pressure, or the valve itself may be worn. A plumber should check it, since it’s a protective device.
Across the garage slab, under the door into the house, and into the bottom of shared walls. Moisture meters confirm how far.
It varies with the type, water quality and maintenance. The age on the label is a useful guide to planning a replacement.
For heaters in closets, upstairs or in finished spaces, a drain pan piped to a drain is a sensible precaution.
A garage slab dries relatively quickly. Drywall, subfloor or crawl space areas take several days.
Yes. Crews typically take photos before and during the work, log moisture readings and note what was removed or dried. Ask for copies and keep them with your house records.
Water that is warm, rusty or concentrated around the heater’s base points to the heater. Water that comes in under the garage door or along the wall during heavy rain points to drainage. If the heater is off and the water keeps coming, look outside.
Water heater let go?
Call and we’ll help you shut it down and connect you with a local crew to clean up and dry out.
Clear next steps on the phone, and pricing before any work.
Call (425) 380-0163 About the Heater