By Brent Applegate, Licensed Master Plumber | Polly Plumbing
Serving Keller, Southlake, Trophy Club, Roanoke and all of Tarrant and Denton Counties
Polly Plumbing provides same-day water heater installation in Southlake TX for confirmed failures and across all of Tarrant and Denton Counties.
A water heater leaking in Keller TX is one of the most urgent calls Brent receives and knowing where the leak is coming from is the difference between a same-morning fitting repair and an emergency tank replacement. This guide covers every question Keller and Tarrant County homeowners ask the moment they find water under their unit: why a hot water heater starts leaking, whether it is dangerous, the five steps to take right now, whether you can still shower, and whether homeowner’s insurance will cover any of the damage.
Why Water Heater Leaking in Keller TX Demands Immediate Action
A water heater leaking in Keller TX can go from a slow drip to a catastrophic failure with no additional warning. Where the water is coming from determines everything: whether you are looking at a fitting repair or a same-day replacement, whether you can wait until Monday or need a plumber today.
A homeowner in North Richland Hills found a puddle under her water heater at 6:30am. She called Polly Plumbing before looking anything up.
Brent walked her through five steps on the phone in two minutes. She turned off the cold water supply and the gas valve. She sent him a photo. Bottom of the tank, right seam, slow but steady drip with rust streaking. The unit was 13 years old.
“I’ll be there by 9am with a replacement unit on the truck.” He was. The new unit was running by noon. The old unit had not failed catastrophically, but it was close. The bottom seam was the tank telling her its time was up.
How to Tell If Your Water Heater Is Leaking in Keller TX
Before acting, confirm you are dealing with an actual leak and not condensation. In Keller and Tarrant County during summer months, cold incoming water in a warm garage or utility room produces condensation on the cold water inlet pipe and sometimes on the tank body itself. This looks exactly like a water heater leaking in Keller TX.
Quick diagnosis: Wipe the suspected area completely dry with a paper towel. Wait 30 minutes without touching it. If moisture returns uniformly over a broad surface area, that is condensation and requires no repair. If moisture returns as a drip from a specific point, that is a leak. Act on it.
Additional signs of a hot water heater leaking that do not always show as a visible puddle: a rust or mineral stain ring on the floor beneath the unit, a persistent musty smell in the utility room or garage, an unexplained increase in your water bill, or the sound of dripping when no fixtures are running.
Water Heater Leaking in Keller TX: Do These Five Things First
Step 1: Turn off the cold water supply to the unit. The shutoff valve is on the cold water pipe going into the top of the water heater. Turn it clockwise until it stops. This stops new water from entering the tank and feeding the leak.
Step 2: Turn off the energy supply. For gas units: turn the gas valve behind the unit to the off position, or set the thermostat dial to pilot. For electric units: flip the circuit breaker for the water heater at your electrical panel.
Step 3: Locate where the water is coming from. Look carefully at the top of the unit, the side near fittings, any valve, the drain at the bottom, and the tank seam itself. Take a photo on your phone. This is the single most useful piece of information you can give a plumber on the first call. If you are asking how to stop a water heater from leaking, this is step one: identify the source before doing anything else.
Step 4: Mop up standing water and place towels. Standing water causes floor damage in the time between now and when a plumber arrives. Remove it now. According to FEMA, water damage left untreated even briefly begins damaging flooring, drywall, and subflooring in ways that multiply total repair costs significantly.
Step 5: Do not turn the unit back on. A water heater leaking in Keller TX and running under pressure can accelerate the failure. Leave it off until a plumber has assessed it in person.
Is a Leaking Water Heater Dangerous?
Yes, depending on where the leak is coming from and how severe it is.
A fitting or valve leak at the top or side of the unit is low immediate danger. The water is under supply pressure but the volume is controlled and the unit can be safely shut off following the five steps above. Do not ignore it, but it is not an emergency requiring you to leave the house.
A T and P valve that is fully discharging, releasing a sustained stream rather than an occasional drip, is a genuine safety emergency. The T and P valve opens when internal temperature or pressure exceeds safe limits. A sustained discharge means the tank is operating at dangerous pressure or temperature levels. Turn off the water heater immediately, do not attempt to cap the valve or stop the flow, and call a plumber today.
A tank body leak at the bottom seam is serious for two reasons. First, it can accelerate to catastrophic failure, releasing 40 to 50 gallons of scalding water onto your floor with no additional warning. Second, in a Keller or Tarrant County garage, a sudden tank failure can damage flooring, drywall, stored items, and in some cases the structure itself. Same-day replacement is the correct response.
A gas water heater with any visible leak near the gas valve or gas line connections is a potential gas safety issue, not just a water issue. If you smell gas near a leaking water heater at any point, leave the home, do not operate any electrical switches, and call ATMOS Energy’s emergency line before calling a plumber.
Why Is My Water Heater Leaking?
This is the question Brent hears most often on a first call about a water heater leaking in Keller TX. The answer depends entirely on where the water is coming from.
Why is my water heater leaking from the top?
A leak from the top of the unit is almost always one of three things: a loose or corroded cold water inlet or hot water outlet connection, a deteriorated dielectric union at the inlet or outlet port, or a weeping anode rod port if the rod has been depleted. All three are repairable. Tarrant County hard water accelerates corrosion at these threaded connections faster than the national average, which is why top-of-unit leaks on a hot water heater are more common here than in softer water markets. Repair range: $365 to $610 for dielectric unions.
Why is my hot water heater leaking from the bottom?
A leak at the very base of the tank, specifically from the tank body or bottom seam, almost always indicates the steel tank wall has corroded through from the inside. This is internal tank failure and is not repairable. A small weep from the drain valve spigot at the lower side of the unit is a separate issue: that is a repairable valve problem, not tank failure. If your hot water heater is leaking from the bottom seam with rust streaking, same-day replacement is the only option.
Why is my water heater pressure relief valve leaking?
Three possible causes: the T and P valve itself has failed, system water pressure is genuinely too high, or thermal expansion in a closed plumbing system without an expansion tank is repeatedly triggering the valve. Many older Keller and Tarrant County homes lack a thermal expansion tank. Replacing the T and P valve without diagnosing which situation applies means the new valve will also weep within weeks.
Why is my water heater leaking from a fitting or connector?
Flex connectors can develop pinhole leaks at compression fittings over time. Dielectric unions deteriorate at the threads in Tarrant County hard water. Both are straightforward repairs worth doing on units under 10 to 12 years old. A hot water heater leaking from a connector or fitting is the most repairable scenario in this list.
What to Do If Your Water Heater Is Leaking from the Bottom
A bottom leak is the most urgent scenario for any water heater leaking in Keller TX. It deserves its own section.
First, confirm it is the tank and not the drain valve. The drain valve is a spigot located on the lower side of the tank, a few inches above the floor. If the drip is coming from that valve, it is a repairable valve issue. If water is seeping from the seam where the tank body meets the base, or from the tank wall itself with rust streaking, that is tank failure and there is no repair.
Second, turn off the cold water supply and gas supply or circuit breaker immediately.
Third, take a clear photo of the leak source and call a plumber. For a confirmed bottom seam leak in the Keller area, Brent arrives with a replacement unit on the truck. According to the U.S. Department of Energy, sediment buildup and internal corrosion from hard water are the leading causes of tank failure in residential water heaters. In Tarrant County’s 15 to 25 GPG water, this process happens roughly twice as fast as the national average.
Can I Take a Shower If My Water Heater Is Leaking?
It depends entirely on where the leak is coming from.
If the leak is from a fitting, dielectric union, or flex connector at the top or side of the unit and you have already turned off the cold water supply, the tank still contains the water that was in it before you shut the supply off. You can draw from that stored hot water once, but the tank will not reheat and will not refill until the repair is complete.
If the leak is from the T and P valve with a sustained discharge, do not use hot water at all. Adding demand to a compromised system is not safe.
If the leak is from the tank body at the bottom seam, do not use hot water. The cold water supply should already be off.
The short answer: if the cold water supply is off and the water heater leaking in Keller TX is from a fitting or valve rather than the tank body, a single short shower from the stored water is not dangerous. If the leak is from the tank body or the T and P valve is fully discharging, wait.
Will a Leaking Water Heater Explode?
A leaking water heater will not explode simply because it is leaking. The two scenarios where an explosion is a genuine risk are distinct from a typical tank seam or fitting leak.
The first scenario is a T and P valve that is failing, stuck closed, or has been deliberately capped and cannot open. The T and P valve is the safety release that prevents a tank from building to explosive pressure. If the valve has been capped by a previous owner, something Brent occasionally finds on older Keller installations, internal pressure can build to catastrophic levels during a heating cycle. This is why a weeping T and P valve should be diagnosed rather than capped, and why any capped valve Brent finds on an older unit is flagged as a safety priority.
The second scenario is a gas leak coinciding with a water leak. This is not an explosion risk from the water heater itself but from gas accumulation in an enclosed garage or utility room. If you smell gas near a water heater leaking in Keller TX, treat it as a gas emergency and call ATMOS Energy before calling a plumber.
A standard tank body leak at the seam, a dripping fitting, or a weeping drain valve: none of these create explosion risk on their own. The risk from those leaks is water damage and eventual catastrophic hot water release if the tank body failure progresses.
Is a Leaking Water Heater Covered by Insurance?
Homeowner’s insurance coverage for a water heater leaking in Keller TX depends on the cause and the specific policy language.
What is typically covered: Sudden and accidental water damage caused by a water heater failure. If your tank fails and releases water that damages your flooring, drywall, and stored belongings, the resulting water damage is usually covered under the dwelling and personal property sections of a standard homeowners policy.
What is typically not covered: The water heater unit itself. Most standard homeowners policies treat appliance replacement as a maintenance expense. Gradual leaks that developed over time are frequently excluded as a maintenance failure rather than a sudden loss.
What to do before calling your insurer: Take photos of the leak source, the affected area, and any damaged property before any cleanup or repair begins. Call your plumber first to stop the damage, then call your insurer. Do not discard the old unit until your insurer has had a chance to inspect or waive inspection. Brent documents the failure mode and leak source in his written installation summary, which serves as supporting documentation for your claim. The Texas Department of Licensing and Regulation requires licensed plumbers to document all work completed, which creates a verifiable paper record of the failure.
Find Your Leaking Water Heater Source: Six Locations and What Each Means
Work through these six locations from top to bottom and match your situation to the right verdict.
Location A: Top of the Unit — Cold and Hot Water Connection Pipes Verdict: Usually Repairable
Water at the very top near where the pipes connect is almost always a fitting issue: a loose connection, deteriorated thread sealant, or a corroded dielectric union. Worth repairing on units under 10 years old. If the unit is 12 or more years old, use the service visit as a full assessment opportunity. Repair range: $365 to $610.
Location B: Upper Side — Dielectric Unions or Flex Connectors Verdict: Usually Repairable
Dielectric unions connect the supply pipes to the tank inlet and outlet ports. They deteriorate at the threads in Tarrant County hard water. Flex connectors can develop pinhole leaks at compression fittings. Both are worth repairing on units under 10 to 12 years old. Repair range: $240 to $610 depending on which component.
Location C: Top Center — Anode Rod Port Verdict: Repairable
The anode rod port at the top of the tank can leak when the rod has corroded away completely, leaving a deteriorated thread seal. Worth addressing on units under 12 years old. In Tarrant County hard water, anode rod service is due every three to five years, earlier than the national average.
Location D: Lower Side — Drain Valve Verdict: Usually Repairable
The drain valve spigot near the bottom of the tank is a common source of slow drips on older units. The valve seat deteriorates over years of non-use. Worth addressing on units under 12 years old.
Location E: Side — Temperature and Pressure Relief Valve Verdict: Assess Carefully
The T and P valve discharging can result from three situations: the valve has failed ($475 to $790 to replace), system water pressure is genuinely too high, or thermal expansion in a closed plumbing system is repeatedly triggering the valve. Do not replace the T and P valve without diagnosing which situation applies. A replaced valve on a system with uncorrected thermal expansion will weep again within weeks. Complete fix including expansion tank: $1,035 to $1,725.
Safety note: A T and P valve fully discharging, releasing a sustained stream, is a potential safety emergency. Turn off the water heater immediately and call a plumber today.
Location F: Bottom — Tank Body or Seam Verdict: Replace Same Day
A water heater leaking in Keller TX from the tank body itself indicates internal corrosion. There is no repair for a corroded tank body. The unit needs same-day replacement to prevent catastrophic failure releasing 40 to 50 gallons of scalding water with no further warning. In Tarrant County hard water without a softener, this failure typically occurs between years 10 and 14.
Turn off the cold water supply and gas supply immediately and do not run hot water in the house until the replacement is complete.
How to Fix a Leaking Water Heater: Repair or Replace?
Can a leaking water heater be repaired? Yes, in many cases. The answer depends entirely on where the leak is and how old the unit is.
Repair makes sense when: The leak is from a fitting, valve, or flex connector, not the tank body. The unit is under 10 years old in Tarrant County hard water without a softener, or under 12 years with a softener. No other signs of tank deterioration are present. Repair cost is under 40 percent of replacement cost.
Replace makes sense when: The leak is from the tank body itself. The unit is 12 or more years old in Tarrant County without a softener. Rust-colored hot water or significant sediment is present. Multiple component failures have occurred in quick succession. Repair cost approaches 50 percent of replacement cost.
What a Water Heater Leak Repair or Replacement Costs in Keller TX 2026
These are Polly Plumbing’s all-in installed prices for the Keller and Tarrant County area. Each range reflects the spread between straightforward and more complex scenarios.
| Service | Keller TX Price Range | Verdict | Notes |
|---|---|---|---|
| Dielectric union replacement (single) | $240 to $405 | Repair | Worth it on units under 10 years old |
| Dielectric unions, hot and cold pair | $365 to $610 | Repair | Most common top-of-unit leak repair |
| Flex connector replacement | $240 to $405 | Repair | Quick repair, usually same visit |
| T and P valve replacement | $475 to $790 | Assess First | Diagnose cause before replacing |
| T and P valve plus expansion tank | $1,035 to $1,725 | Repair | Complete fix when thermal expansion is the cause |
| Expansion tank only | $560 to $935 | Repair | Required on all new installations in Keller |
| Gas valve replacement | $620 to $1,035 | Assess | Compare to replacement on units over 10 years |
| Electric heating element (upper or lower) | $455 to $925 | Repair | Worth it on units under 12 years old |
| Full electric water heater rebuild | $720 to $1,200 | Repair | Both elements and both thermostats |
| 50-gal gas tank replacement, 6-year warranty | $2,510 to $4,185 | Replace | Includes unit, labor, permit, disposal |
| 50-gal gas tank replacement, 10-year warranty | $3,095 to $5,155 | Replace | Better unit, longer coverage, same-day in Keller |
| Gas tankless replacement | $10,095 to $16,825 | Assess First | See tankless vs tank guide before deciding |
Who to Call for a Leaking Water Heater in Keller TX
A homeowner in Keller called at 8am about a puddle under his 11-year-old water heater. Brent walked him through the five steps on the phone, confirmed from the photo that the water heater was leaking from the bottom tank seam, and arrived at 10:30am with a replacement 50-gallon unit on the truck. The homeowner had hot water by early afternoon. He mentioned the two other plumbers he had called could not come until the following week.
When you call Polly Plumbing for a water heater leaking in Keller TX, Southlake, Trophy Club, Roanoke, or anywhere in Tarrant County and Denton County, Brent walks you through the five steps on the phone before arriving. You get a text with his photo before he knocks. He gives you a written assessment specifying the leak source, the repair-versus-replace determination, and the rationale before any work begins. Brent holds a Master Plumber license through the Texas Department of Licensing and Regulation, which requires demonstrated competency across every water heater leak scenario covered in this article. For confirmed bottom tank leaks in the Keller service area, he arrives with a replacement unit on the truck.
Call 817-776-0007.
Frequently Asked Questions About Water Heater Leaking in Keller, TX
What should I do first if my water heater is leaking? Turn off the cold water supply to the unit. Turn off the gas supply or circuit breaker. Locate and photograph where the water is coming from. Mop up standing water. Do not turn the unit back on. Then call a plumber with the photo ready. A water heater leaking in Keller TX should never be left running under pressure while you wait for help.
Is it condensation or a real leak on my water heater? Wipe the area dry and wait 30 minutes. If moisture returns uniformly over a broad surface, that is condensation and requires no repair. If moisture returns as a drip from a specific point, that is a leak and needs to be assessed by a plumber.
My water heater is leaking from the bottom. Does it need to be replaced? Almost always yes. A leak from the tank body indicates internal corrosion. There is no repair for a corroded tank body. Same-day replacement is needed to prevent catastrophic failure. This is the expected failure mode for units 10 to 14 years old in Tarrant County hard water without a softener.
Why is my water heater pressure relief valve leaking? Three possible causes: valve failure, genuinely high system pressure, or thermal expansion in a closed plumbing system without an expansion tank. Many older Keller and Tarrant County homes lack a thermal expansion tank. Replacing only the T and P valve without addressing thermal expansion means the new valve will also weep within weeks.
Can a leaking water heater be repaired instead of replaced? It depends entirely on where the leak is coming from. Leaks from fittings, valves, dielectric unions, and flex connectors are almost always repairable. Leaks from the tank body are not repairable. Age matters: a fitting repair on a 13-year-old unit in Tarrant County hard water may buy 12 to 18 months before the next failure.
How long do water heaters last in Keller TX? In Tarrant County hard water without a softener, 10 to 11 years is the realistic expected lifespan for a tank unit. With a softener, 12 to 15 years. Both figures are shorter than the national average because Tarrant County water hardness (15 to 25 GPG) accelerates internal corrosion and anode rod deterioration faster than most areas in the country. For the full breakdown, see our complete water heater lifespan guide for North Texas homeowners.
How does Tarrant County hard water cause water heater leaks? Tarrant County water hardness runs 15 to 25 grains per gallon, roughly double the national average. That hardness deposits calcium and magnesium on internal tank surfaces and accelerates corrosion of the steel tank wall, the anode rod, and the dielectric unions at the inlet and outlet ports. Hard water is the primary reason a water heater leaking in Keller TX tends to occur two to four years earlier than in lower-hardness markets. A whole-home water softener is the single most effective step a homeowner can take to extend tank life.
Will a leaking water heater explode? Not from the leak itself. The explosion risk with a water heater comes from a disabled or stuck T and P valve that cannot release pressure during a heating cycle, not from a typical seam or fitting leak. A standard tank body leak, dripping fitting, or weeping drain valve does not create explosion risk. The risk from those leaks is water damage and eventual catastrophic hot water release if the tank body failure progresses.
Is a leaking water heater covered by homeowner’s insurance? Typically, the water damage to your home caused by a sudden tank failure is covered. The water heater unit itself is usually not. Gradual leaks that developed over time may be excluded as a maintenance issue. Document the leak source with photos, call your plumber first to stop the damage, then report to your insurer. Do not discard the failed unit until your insurer has had a chance to inspect.
Can I take a shower if my water heater is leaking? If the cold water supply is off and the water heater leaking in Keller TX is from a fitting or valve rather than the tank body, a single short shower from the stored water in the tank is not dangerous. If the leak is from the tank body or the T and P valve is fully discharging, do not use hot water and do not restore power or gas to the unit until a plumber has assessed it.
Written by Brent Applegate, Licensed Master Plumber, Polly Plumbing. Based in Keller, TX.