Tankless Water Heater Repair in Mount Pleasant, SC
Error code on your tankless display? KBN Plumbing services Navien, Rinnai, Noritz and Rheem tankless water heaters in Mount Pleasant, SC.
- Fast Tankless Diagnostics
- Lasting Solutions
- Upfront Pricing
- Fast, Reliable Service
Need Tankless Water Heater Repair Done Right in Mount Pleasant, SC?
We descale, test and repair tankless units using manufacturer diagnostic steps.
Experienced Tankless Water Heater Repair in Mount Pleasant, SC for Gas and Electric Units
When your tankless unit isn't delivering hot water, KBN Plumbing is here to help residents in Mount Pleasant, SC. Our trained technicians quickly identify the root cause of the malfunction, so your tankless water heater is repaired correctly and your continuous hot water supply is restored.
Our expertise includes:
- Igniter, flame rod, flow sensor and thermistor testing and replacement
- Diagnosing and repairing flow sensor issues.
- Replacing heat exchangers and igniters

Additional Plumbing Repair Services in Mount Pleasant, SC
We offer expert plumbing repair services across Mount Pleasant, SC to stop leaks, clear blockages, and keep every fixture working the way it should.

Customers
Why Choose KBN Plumbing for Tankless Water Heater Repair in Mount Pleasant, SC?
We are focused on providing clear communication, honest assessments and effective repairs every time.
- Advanced Tools, We use dedicated diagnostic tools and equipment to accurately pinpoint problems within your tankless system, avoiding guesswork.
- Scale Experts, We descale thoroughly and recommend softening or scale filters suited to your water.
- South Carolina Expertise, We understand how local water and seasonal conditions can affect tankless systems and fit our solutions accordingly.
Citywide Coverage
KBN Plumbing proudly serves every neighborhood in Mount Pleasant, providing prompt and reliable tankless water heater repair services. No matter where you are located within Mount Pleasant, our experienced technicians are just a call away, ready to restore your hot water.
Experienced Team
Our technicians work on tankless systems every week and are familiar with condensing designs, recirculation pumps and cascaded units. They diagnose with manometers, multimeters and manufacturer service modes.
Safety-First Approach
Condensing units produce acidic condensate, so we make sure it drains properly and is neutralized where required. All repairs are tested for leaks and safe operation before we leave.
Trusted Certified Mount Pleasant Plumbing Services Professionals
At KBN Plumbing, we take pride in providing certified plumbing services throughout Mount Pleasant, SC. Backed by leading industry credentials, our experienced plumbers combine technical skill with genuine customer care. Whether it is repair, installation, or maintenance, we follow strict safety and quality standards to deliver long-lasting results you can trust.
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PHCC Plumbing Contractor Recognition
Better Business Bureau (BBB) Accreditation
Angi Certified Pro
ISO 9001 Quality Management CertificationTrusted Tankless Water Heater Repair Services in Mount Pleasant, SC
Pilot Light & Ignition Repair in Mount Pleasant, SC
For gas-fired tankless water heaters, a malfunctioning ignition system can completely stop hot water production. Our team in Mount Pleasant, SC diagnoses issues with igniters, flame sensors and gas valves. We confirm proper gas pressure and ventilation are maintained for safe and efficient operation. Timely repair of these components prevents dangerous gas problems and restores your unit's ability to heat water on demand.

Emergency Tankless Repair in Mount Pleasant
A tankless unit that leaks internally or shows a fault you cannot clear needs prompt attention. We put first no-hot-water calls and arrive with common sensors, igniters and filters. If a major component like a heat exchanger has failed, we check warranty coverage and order the part. We can often restore partial operation in the meanwhile.
Noritz Tankless Water Heater Repair in Mount Pleasant, SC
Noritz tankless heaters are known for their robust design, but can sometimes face issues such as flow sensor faults or venting problems. We provide dedicated repair services for Noritz units in Mount Pleasant, SC, ensuring proper combustion, water flow and exhaust, which are essential for safe and efficient operation.
Ignition Failure Repair in Mount Pleasant, SC
If your tankless unit will not fire, the cause may be a dirty flame rod, a bad igniter, low gas pressure or a blocked intake. We test each component and measure gas pressure at the inlet. Undersized gas lines are a frequent hidden cause when a tankless unit replaced a tank. We correct the issue so the unit lights reliably.
Tankless Descaling and Flushing in Mount Pleasant
Hard water leaves calcium and magnesium scale inside the heat exchanger, restricting flow and causing overheating. Many units warn of this with scale codes, such as the LC code on Rinnai models. We connect a circulation pump to the service valves and run a descaling solution through the exchanger. Annual descaling is wise for most homes on hard water.
Tankless Water Heater Error Code Diagnostics in Mount Pleasant, SC
Modern tankless water heaters display error codes to indicate specific problems, from flow rate issues to combustion errors. Our experts in Mount Pleasant, SC are trained to interpret these codes accurately, using specialized diagnostic tools to pinpoint the exact component failure. This accuracy allows us to quickly order the correct parts and perform targeted repairs, saving you time and money. We address codes related to burner failures, fan issues and temperature sensor errors, among others.
Navien Tankless Water Heater Repair in Mount Pleasant
Navien units are known for their advanced condensing technology but can sometimes experience issues with their circulation pump or exhaust systems. KBN Plumbing provides dedicated Navien tankless water heater repair in Mount Pleasant, addressing common problems like ignition failures or condensate drain blockages. Our team is familiar with Navien's parts and troubleshooting protocols, ensuring a precise and effective repair that maintains your unit's high efficiency.

Commercial Tankless Water Heater Repair in Mount Pleasant
Commercial tankless water heaters in Mount Pleasant face heavier usage and require durable repair solutions. Whether it is for a restaurant, hotel or office building, we understand the urgency of maintaining hot water availability. Our commercial tankless water heater repair services address larger capacity units, complex manifold systems and often more serious scaling issues. We focus on fast, efficient service to minimize disruption to your business operations.
Tankless Water Heater Repair Near Me in Mount Pleasant, SC
We pride ourselves on being the trusted local experts for tankless water heater repair throughout Mount Pleasant. Our quick response times and commitment to quality mean residents get their hot water systems back online quickly and efficiently, no matter where they are located in South Carolina.
When you search for 'tankless water heater repair near me' in Mount Pleasant, SC, KBN Plumbing is your go-to local expert. Our local teams allow for quick response times to address your urgent hot water needs.
KBN Plumbing at a Glance
- Licensed and insured plumbers serving Mount Pleasant, SC
- 24/7 emergency service with same-day scheduling
- Clear written estimates, no hidden fees
- 4.8-star rated by 596+ South Carolina customers
Mount Pleasant Map
Mount Pleasant Information
- Population
- 95,232
- Area codes
- 843/443/803
- Service area
- Mount Pleasant and communities within 40 miles
- Nearby
- Charleston, North Charleston, Goose Creek, Summerville
Private wells are common outside town limits, and some South Carolina well water carries iron, low pH or sediment that can stain fixtures and wear down water heaters. For homes in Mount Pleasant, SC, efficient tankless water heater repair is vital for fighting mineral buildup and keeping hot water consistent in every season.
Expert Services
Trust our professionals for reliable KBN Plumbing solutions in Mount Pleasant, SC.
Our Specialized Plumbing Services in Mount Pleasant, SC
At KBN Plumbing, we provide a complete range of plumbing services across Mount Pleasant, SC. From leak detection to full system installations, our team ensures fast, precise, and affordable service for both residential and commercial properties. Explore our core services below:
How Our Tankless Water Heater Repair Process Works in Mount Pleasant, SC
Here is how we diagnose and repair your tankless water heater.
Request a Quote
Contact us at (864) 588-3813 to describe your tankless water heater issue. We will schedule a convenient time for a technician to visit your Mount Pleasant home and provide an upfront quote.
Diagnosis
Our trained technician arrives on time, performs a thorough diagnostic check of your tankless unit and explains the problem in plain language.
Expert Repair
We carry out the necessary repairs using quality parts, making sure your tankless water heater is functioning correctly and safely before we leave.
Frequently Asked Questions About Tankless Water Heater Repair in Mount Pleasant
Most tankless repairs cost between $175 and $600, depending on the part. Descaling service often runs $175 to $350, while heat exchanger replacement can exceed $800 if not under warranty. We quote before starting.
In homes with hard water and no softener, once a year is a good rule. Homes with a softener may go longer, but annual inspection is still smart.
Yes, KBN Plumbing stands behind its work. All our tankless water heater repairs come with a satisfaction guarantee and a warranty on both parts and labor. We will provide specific warranty details with your repair estimate.
We stand behind our tankless water heater repairs with a solid warranty on both parts and labor. The exact warranty period will be discussed with you before any work begins, providing you peace of mind.
Most repairs and descaling are done in one to three hours. If a part must be ordered, we typically return within a few business days.
Fluctuating temperatures can come from low flow rates, a dirty inlet filter, a failing flow sensor or scale on the heat exchanger. Crossed hot and cold lines at a fixture can cause it too.
Common signs include inconsistent hot water, a sudden loss of hot water, strange noises like banging or popping, a rotten egg smell or error codes displayed on the unit. Any of these symptoms call for a professional inspection.
Frequent causes of failure include mineral buildup from hard water, ignition problems, faulty flow sensors, clogged air filters, exhaust venting issues and electrical component failures. Regular maintenance, including descaling, can prevent many of these problems.
What People Are Saying About Our Plumbing Experts?

Robert G.
The trenchless sewer replacement saved our front yard. They walked us through the camera inspection footage first so we knew exactly what we were paying for.
Sewer Line Replacement · Goose Creek, SC
Mark T.
When our office needed drain cleaning, KBN Plumbing provided quick, reliable service. The plumber arrived on time and made sure every drain flowed perfectly before leaving. Very satisfied.
Drain Cleaning · Mount Pleasant, SC
Patricia H.
We had a slab leak that two other companies could not find. KBN Plumbing located it in under an hour, explained our options, and the price matched the quote to the dollar.
Slab Leak Repair · Goose Creek, SC
Daniel K.
A pipe burst at 11 pm and they actually answered. The plumber showed up within the hour, shut everything down, and had us back to normal the next morning. Could not ask for more.
Emergency Plumbing · Hilton Head Island, SC
Emily R.
I called KBN Plumbing for plumbing repair, and the technician was fast, polite, and thorough. They explained the problem clearly and fixed it the same day. I will definitely hire them again. Highly recommended!
Plumbing Repair · North Charleston, SC
Sofia M.
Two new toilets installed in one visit, no mess left behind, and the tech even adjusted a faucet he noticed was dripping. Fair pricing and really friendly.
Toilet Installation · Bluffton, SC













