Tankless Water Heater Repair & Service in Atlanta Metro

Getting Cold Showers or Error Codes from Your Tankless Unit?

Is your tankless water heater giving you an icy blast in the shower, flashing a weird error code, or just refusing to get hot at all? These aren't just quirks; they're signs of a real problem inside the unit that needs a professional diagnosis before it gets worse. Head's Plumbing Sales and Service, Inc. has experienced technicians ready to get your hot water running again across the Atlanta Metro.

Warning Signs Your Tankless Water Heater Needs a Pro

When a tankless water heater fails, it gives you signals. Most homeowners notice one of these issues first. Ignoring them usually leads to a complete shutdown and a much bigger headache.

No Hot Water or Intermittent Hot Water

This is the most obvious and frustrating symptom. You turn on the shower and get either straight cold water or a "hot water sandwich"—a brief moment of heat followed by a return to cold. This points directly to a core component failure, like the ignition system not firing or a flow sensor that can't tell you need hot water.

Error Codes on the Unit's Display

That little screen on your unit isn't just for show; it’s a diagnostic tool. When it flashes a code, it's telling you exactly what it thinks is wrong, whether it's a blocked exhaust vent, a flame failure, or an overheating issue. Looking up the code online is a start, but fixing the underlying mechanical or electrical fault requires a technician.

Reduced Hot Water Flow or Pressure

If your hot water just trickles out while the cold water blasts, you likely have a blockage. In the Atlanta area, this is almost always caused by mineral scale buildup inside the unit's heat exchanger. The narrow passages get clogged with sediment, choking off the flow and forcing the heater to work dangerously hard.

Strange Noises Coming from the Unit

Your tankless unit should be relatively quiet. If you start hearing loud clicking, grinding, or a deep rumbling sound, something is wrong. Clicking can be a failing igniter, grinding often points to a worn-out fan motor, and rumbling or banging is a tell-tale sign of severe scale buildup causing water to boil inside the heat exchanger.

Water Leaking Around the Unit

Any water pooling under or dripping from your tankless heater is a serious red flag that needs immediate attention. Leaks can come from a loose fitting, a failed pressure relief valve, or, in the worst-case scenario, a cracked heat exchanger. Water and the electronics inside these units are a dangerous mix, and the leak can cause significant damage to your home.

Common Causes of Tankless Water Heater Problems

After servicing hundreds of tankless units around Atlanta, we've found that most failures trace back to a handful of common issues. These aren't DIY fixes; they involve gas lines, high-voltage electronics, and complex internal parts.

Sediment Buildup (Hard Water)

This is the number one killer of tankless water heaters in our region. The water here contains dissolved minerals that solidify when heated, creating a rock-hard scale that clogs the heat exchanger. This forces the unit to overheat, reduces water flow, and will eventually cause a total system failure if not professionally flushed out.

Ignition or Flame Sensor Failure

For a gas unit to work, it has to safely ignite a flame and know that the flame is lit. The igniter can crack and fail, or the flame sensor can get coated in carbon and stop detecting the flame, causing the unit to shut down as a safety precaution. This is a common point of failure after a few years of service.

Venting or Exhaust Obstructions

Your unit needs to breathe. It pulls in fresh air for combustion and pushes out exhaust gases. If the intake or exhaust vents get blocked by a bird's nest, leaves, or even an insect nest, the unit's safety sensors will prevent it from running to avoid a dangerous buildup of carbon monoxide.

Overloaded System

Tankless water heaters have a limit to how much hot water they can produce at once. If you're running the dishwasher, a load of laundry, and two showers at the same time, the unit may struggle to keep up. This can result in lukewarm water for everyone and puts a heavy strain on the components, leading to premature failure.

What to Expect During Your Repair Visit

When you call us for a tankless water heater repair, you're getting a technician focused on finding the root cause, not just a quick fix. Our process is direct and transparent, built on the professional standards our family established back in 1981. We're here to solve the problem for good.

First, our technician will have a conversation with you to understand exactly what you've been experiencing. We'll then perform a full diagnostic, checking error codes, testing gas and water pressures, inspecting the venting, and analyzing the unit's performance. We don't guess; we use our tools and experience to isolate the specific component that has failed.

Once we know exactly what's wrong, we'll explain the issue to you in plain language, show you the faulty part if possible, and provide a clear, upfront price for the repair. With your approval, we'll get to work, as our trucks are stocked with the most common parts for tankless brands. After the repair, we test the system thoroughly to ensure it’s operating safely and delivering the consistent hot water you expect.

Tankless Water Heater Repair & Service Coverage Across Atlanta Metro

Our family has served homeowners across the region for generations, and our team is ready to provide expert tankless water heater diagnostics and repair wherever you are. We cover communities throughout the greater Atlanta area.

North Metro Atlanta: Marietta, GA, Smyrna, GA, Vinings, GA, Doraville, GA, Dunwoody, GA, Norcross, GA, Roswell, GA, Sandy Springs, GA

West Metro Atlanta: Lithia Springs, GA, Mableton, GA, Austell, GA, Douglasville, GA, Powder Springs, GA

Central & East Atlanta: Atlanta, GA, Decatur, GA, Avondale Estates, GA, Clarkston, GA, Grayson, GA, Scottdale, GA, Snellville, GA

Southeast Metro Atlanta: Forest Park, GA, Conley, GA, Ellenwood, GA, Hampton, GA, Jonesboro, GA, Locust Grove, GA, Lovejoy, GA, McDonough, GA, Morrow, GA, Redan, GA, Rex, GA, Riverdale, GA, Stockbridge, GA

Southwest Metro Atlanta: College Park, GA, East Point, GA, Fairburn, GA, Hapeville, GA, Union City, GA, Fayetteville, GA, Newnan, GA, Palmetto, GA, Peachtree City, GA, Sharpsburg, GA, Tyrone, GA

Related Tankless Water Heater Services

While we can repair most issues, some problems are preventable. We strongly recommend regular Tankless Water Heater Maintenance & Tune-Up to descale the unit and catch small problems before they cause a breakdown. If your unit is over 10-12 years old or the repair is extensive, it may be more cost-effective to consider a new Tankless Water Heater Installation & Replacement for better efficiency and reliability.

Get Your Hot Water Back Today

You don't have to put up with a faulty tankless water heater. A lack of reliable hot water disrupts your entire household, from morning showers to washing dishes. We understand how crucial it is to get this fixed quickly and correctly.

At Head's Plumbing Sales and Service, Inc., we've been solving these exact problems for Atlanta homeowners since 1981. Our family is dedicated to providing honest, expert repairs that last. If you're ready to stop worrying about your hot water, reach out to our team through the website and we'll get you on the schedule.

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Contact us today to discuss your needs. Our team is ready to help.

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Other Services

• Tankless Water Heater Installation & Replacement
• Tankless Water Heater Maintenance & Tune-Up
• Tankless Water Heater Inspection & Testing
• Tankless Water Heater Emergency Repair

Service Areas We Cover

• Atlanta
• Service Areas
• College Park
• Decatur
• East Point
• Fairburn
• Forest Park
• Hapeville
• Lithia Springs
• Marietta

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Water heater acting up? Repair or replace?

Answer three quick questions for a ballpark recommendation. It's a guide, not a quote — your technician confirms the right call on site.

How old is the unit?10 yearsNew25+ yrsWhat type?What's the main symptom?Our recommendationLikely repairable

No hot water is most often a failed element or thermostat (electric), or a pilot/igniter issue (gas) — repairable parts on a unit this age. We'd confirm the exact failure and fix it.

Typical ballparkTank repair$150–$700

Ballpark only — actual cost varies by unit, fuel type, code upgrades, and site conditions. We give you an exact, up-front quote before any work.

Get an exact quote(678) 203-8627

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Contact us today for a free estimate. Our certified professionals are ready to help.

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