Top-rated tankless water heater repair pros.

Get matched with top tankless water heater repair pros in your area

Enter your zip and get matched with up to 3 pros

Matching on HomeAdvisor

Share some details icon
Share some details about your home project.
Match with local pros icon
Within moments, match with highly-rated local pros.
Compare quotes icon
Compare quotes and choose the best pro for the job.

Tankless water heater repair pros in Castroville

Avatar for Juan's Plumbing Services, LLC
Juan's Plumbing Services, LLC
10730 Potranco Rd, Suite 122 Box 203
5.00(
5
)
Approved Pro
Juan's Plumbing Services, LLC
10730 Potranco Rd, Suite 122 Box 203
5.00(
5
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
6 years of experience

Juan's Plumbing Services is a locally owned & operated business located in San Antonio. With over 14 years of experience as a Master Plumber, you can trust us to complete your plumbing project to perfection every single time. We pride ourselves on delivering exceptional customer service and turning every customer into a life-time customer. Call today to set an appointment! You'll be glad you did.

"Will definitely recommend Juanâ s plumbing. Had my repair done the same day."

Maria J on May 2023

Juan's Plumbing Services is a locally owned & operated business located in San Antonio. With over 14 years of experience as a Master Plumber, you can trust us to complete your plumbing project to perfection every single time. We pride ourselves on delivering exceptional customer service and turning every customer into a life-time customer. Call today to set an appointment! You'll be glad you did.

"Will definitely recommend Juanâ s plumbing. Had my repair done the same day."

Maria J on May 2023


Avatar for 72 Degrees Air Conditioning, Heating, and Plumbing - Texas
72 Degrees Air Conditioning, Heating, and Plumbing - Texas
684 FM 2093, Suite 100
5.00(
5
)
Approved Pro
72 Degrees Air Conditioning, Heating, and Plumbing - Texas
684 FM 2093, Suite 100
5.00(
5
)
Approved Pro
20 local quotes requested
26 years of experience

72 Degrees Air Conditioning, Heating & Plumbing is your trusted source for 24/7, premium HVAC services in the Texas Hill Country. Since 1986, we’ve been the Wizards of Comfort, providing prompt and professional heating, plumbing, and air conditioning solutions throughout Kerrville, Fredericksburg, Mason and the surrounding areas.

72 Degrees Air Conditioning, Heating & Plumbing is your trusted source for 24/7, premium HVAC services in the Texas Hill Country. Since 1986, we’ve been the Wizards of Comfort, providing prompt and professional heating, plumbing, and air conditioning solutions throughout Kerrville, Fredericksburg, Mason and the surrounding areas.


Owners have combined 10+ years in service, Plumbers have over 50

"They were honest and did exactly what they were supposed to do"

Lance S on April 2025


Avatar for 4m Plumbing Services
4m Plumbing Services
5707 Horizon Dr.
5.00(
11
)
Approved Pro
4m Plumbing Services
5707 Horizon Dr.
5.00(
11
)
Approved Pro
4 years of experience
Free onsite estimate

San Antonio homeowners are smart and we know you’re tired of being overcharged by out-of-town companies that treat you like just another number. At 4M Plumbing, we were born and raised right here in San Antonio. We don’t answer to shareholders, we answer to our neighbors. That’s why we built a plumbing company around what matters to real people here: ✔️ Fair prices that don’t feel like hospital bills ✔️ Quick response times ✔️ Clear communication — start to finish ✔️ Clean, respectful, professional service We specialize in water heaters, sewer line replacements, leak repairs, and more, plus we back our work with real warranties: 🔧 10 years on water heaters 🔧 5 years on sewer line replacements No corporate tricks. Just good plumbing.

"Yes he did! Very knowledgeable and great customer service ?"

devin o on May 2025

San Antonio homeowners are smart and we know you’re tired of being overcharged by out-of-town companies that treat you like just another number. At 4M Plumbing, we were born and raised right here in San Antonio. We don’t answer to shareholders, we answer to our neighbors. That’s why we built a plumbing company around what matters to real people here: ✔️ Fair prices that don’t feel like hospital bills ✔️ Quick response times ✔️ Clear communication — start to finish ✔️ Clean, respectful, professional service We specialize in water heaters, sewer line replacements, leak repairs, and more, plus we back our work with real warranties: 🔧 10 years on water heaters 🔧 5 years on sewer line replacements No corporate tricks. Just good plumbing.

"Yes he did! Very knowledgeable and great customer service ?"

devin o on May 2025


Avatar for Champion A/C, Inc.
Champion A/C, Inc.
2709 Bulverde Rd
4.62(
85
)
Approved Pro
Champion A/C, Inc.
2709 Bulverde Rd
4.62(
85
)
Approved Pro
Customers say: Quick response
Recommended by 92% of Angi customers
Recommended by 92% of HomeAdvisor customers
48 local quotes requested

Undefeated at home since 2007, Champion Cooling, Heating, Plumbing, & Electrical does whatever it takes to clinch total home comfort & 100% customer satisfaction throughout South Central Texas. With honesty & determination, Champion prioritizes the satisfaction of every customer through transparent pricing, educated options, & peace of mind provided by some of the most skilled & community-committed technicians in Texas.

"Very professional and good at communicating. The technician did a great and quick job with the water heater. "

Steve R on March 2025

Undefeated at home since 2007, Champion Cooling, Heating, Plumbing, & Electrical does whatever it takes to clinch total home comfort & 100% customer satisfaction throughout South Central Texas. With honesty & determination, Champion prioritizes the satisfaction of every customer through transparent pricing, educated options, & peace of mind provided by some of the most skilled & community-committed technicians in Texas.

"Very professional and good at communicating. The technician did a great and quick job with the water heater. "

Steve R on March 2025


Avatar for Hill Country Tub and Shower
Hill Country Tub and Shower
5.00(
8
)
Approved Pro
Hill Country Tub and Shower
5.00(
8
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
1610 local quotes requested

Operating as a local family-owned business, we bring a rich 30-year expertise to your doorstep. We’ve established a name for ourselves through our steadfast devotion to high-end services, premier materials, and an unrivaled dedication to making our customers happy. We’ve covered all your needs, from designing your home to professional installations. With us, your vision isn’t just a fantasy but a reasonable, affordable reality.

"Excellent work. Very professional staff. On time and efficient. Clean."

Peter N on March 2025

Operating as a local family-owned business, we bring a rich 30-year expertise to your doorstep. We’ve established a name for ourselves through our steadfast devotion to high-end services, premier materials, and an unrivaled dedication to making our customers happy. We’ve covered all your needs, from designing your home to professional installations. With us, your vision isn’t just a fantasy but a reasonable, affordable reality.

"Excellent work. Very professional staff. On time and efficient. Clean."

Peter N on March 2025


Avatar for Genie Bath Systems
Genie Bath Systems
5680 Randolph Blvd
4.64(
83
)
Approved Pro
Genie Bath Systems
5680 Randolph Blvd
4.64(
83
)
Approved Pro
Customers say: Quality work
4482 local quotes requested
12 years of experience

Genie Bath Systems provides homeowners with custom bath remodeling solutions, to include a full-line accessibility needs. All of our products are custom made in the USA. Factory Certified Installation.Lifetime Warranty.100% Financing . PLEASE NOTE: WE DON"T PERFORM KITCHEN REMODELS

"Last October, my sister, an elderly veteran living alone, contracted Genie Bath Systems to remodel her master and guest baths. She was diagnosed cancer and passed before the remodel was complete. Which, to be fair as we were not able to work with Genie while attending to my sister. The contract was expensive. Very expensive. The cost of the remodel is close to 1/4th the value of her home. I noticed there were issues with the remodel that showed a surprising lack of attention to detail. Genie sent people to address the issues twice. Yet issues remain. My calls to my contact at Genie are now being ignored. Also, the only document I have for the remodel is the contract my sister signed. It is not detailed. I have and continue to ask for a breakdown of the cost. An estimate or work order. This request is also being ignored. I am disappointed and have to wonder why Genie will not provide this information. I have several other questions for Genie that I will not go into here. But based on my experience, I cannot recommend Genie. In fact I would warn anyone considering Genie to be very careful about the cost of the contract."

Greg B on May 2025

Genie Bath Systems provides homeowners with custom bath remodeling solutions, to include a full-line accessibility needs. All of our products are custom made in the USA. Factory Certified Installation.Lifetime Warranty.100% Financing . PLEASE NOTE: WE DON"T PERFORM KITCHEN REMODELS

"Last October, my sister, an elderly veteran living alone, contracted Genie Bath Systems to remodel her master and guest baths. She was diagnosed cancer and passed before the remodel was complete. Which, to be fair as we were not able to work with Genie while attending to my sister. The contract was expensive. Very expensive. The cost of the remodel is close to 1/4th the value of her home. I noticed there were issues with the remodel that showed a surprising lack of attention to detail. Genie sent people to address the issues twice. Yet issues remain. My calls to my contact at Genie are now being ignored. Also, the only document I have for the remodel is the contract my sister signed. It is not detailed. I have and continue to ask for a breakdown of the cost. An estimate or work order. This request is also being ignored. I am disappointed and have to wonder why Genie will not provide this information. I have several other questions for Genie that I will not go into here. But based on my experience, I cannot recommend Genie. In fact I would warn anyone considering Genie to be very careful about the cost of the contract."

Greg B on May 2025


Avatar for Roto-Rooter Plumbing & Water Cleanup
Roto-Rooter Plumbing & Water Cleanup
3603 Metro Pkwy
4.27(
252
)
Approved Pro
Roto-Rooter Plumbing & Water Cleanup
3603 Metro Pkwy
4.27(
252
)
Approved Pro
Customers say: Super punctual
1579 local quotes requested
90 years of experience

When you need an emergency plumber or a drain cleaner, call Roto-Rooter Plumbing & Water Cleanup. Your fast & reliable plumber can fix any plumbing problem, including sump pumps, toilet repair, faucet repair, faucet replacement, garbage disposals, water heaters, bathtubs, showers, and outside faucets. Roto-Rooter is best known for drain cleaning & sewer cleaning. We fix drain clogs, clogged toilets or sinks, blockage of main sewer lines, slow draining shower and bathtub drains, sewer lines and leaking or burst pipes. We also specialize in water damage restoration & water cleanup services. We can fix and clean up your flooded basement too. Roto-Rooter is a 24-hour plumber near you and provides emergency service.

"First time hiring someone for this job. It went well."

Joel M on November 2024

When you need an emergency plumber or a drain cleaner, call Roto-Rooter Plumbing & Water Cleanup. Your fast & reliable plumber can fix any plumbing problem, including sump pumps, toilet repair, faucet repair, faucet replacement, garbage disposals, water heaters, bathtubs, showers, and outside faucets. Roto-Rooter is best known for drain cleaning & sewer cleaning. We fix drain clogs, clogged toilets or sinks, blockage of main sewer lines, slow draining shower and bathtub drains, sewer lines and leaking or burst pipes. We also specialize in water damage restoration & water cleanup services. We can fix and clean up your flooded basement too. Roto-Rooter is a 24-hour plumber near you and provides emergency service.

"First time hiring someone for this job. It went well."

Joel M on November 2024


Avatar for TNT General Maintenance
TNT General Maintenance
Still Brook St
New on HomeAdvisorNew on Angi
Approved Pro
TNT General Maintenance
Still Brook St
New on AngiNew on HomeAdvisor
Approved Pro
5 years of experience
Free onsite estimate

Great service even better quality of work. Taking care of San Antonio’s Plumbing and more for over 20 years! We take care of all plumbing and water treatment needs from leaks, toilet repairs, foundation plumbing and water softeners and reverse osmosis systems.

Great service even better quality of work. Taking care of San Antonio’s Plumbing and more for over 20 years! We take care of all plumbing and water treatment needs from leaks, toilet repairs, foundation plumbing and water softeners and reverse osmosis systems.


Avatar for KE Construction and Renovation
KE Construction and Renovation
5.00(
5
)
Approved Pro
KE Construction and Renovation
5.00(
5
)
Approved Pro
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers
783 local quotes requested

Remodeling business locally owned and operated we feel invested in our clients and constantly strive for customer satisfaction. Call or message us to schedule an estimate today!

"Went very good. Coordination and timing was excellent."

Dennis B on February 2025

Remodeling business locally owned and operated we feel invested in our clients and constantly strive for customer satisfaction. Call or message us to schedule an estimate today!

"Went very good. Coordination and timing was excellent."

Dennis B on February 2025

...
Showing 1-10 of 978

FAQs for tankless water heater installation projects in Castroville, TX

Professional flushing services for tankless water heaters run about $200 per visit. This essential maintenance procedure eliminates mineral deposits from critical components, particularly the heat exchanger. While homeowners can purchase DIY flushing kits for $50 to $100, professional service offers the advantage of thorough cleaning with proper techniques. Professional maintenance also includes inspection of additional components that might need attention.

Industry experts and manufacturers recommend annual maintenance for tankless water heaters, with more frequent service (every six months) for homes with challenging water conditions. This regular attention prevents efficiency losses and extends the unit's operational lifespan. Watch for warning signs like reduced water temperature, inconsistent performance, or system error codes that might indicate maintenance is needed sooner than scheduled.

Neglecting regular maintenance allows mineral scale to accumulate within your system, restricting water flow and reducing heating efficiency. This forces your unit to work harder, consuming more energy while delivering less satisfactory performance. Over time, this strain can lead to component failures, inconsistent water temperatures, and premature system replacement. Additionally, most manufacturers require documentation of regular maintenance to honor warranty coverage for major components.

Share project details to get started.