Top-Rated Tankless Water Heater Installations Experts in San Marcos, TX

Sustainable Plumbing & Air LLC

14205 BURNET RD STE 570 PMB 765341

Locally owned and operated plumbing company focused on residential and commercial installation, service, and repair. Our two Master Plumbers have over 50 years of experience. Let our service exceed your expectation.

"I needed to replace old water heaters and also had some other plumbing work in my home - caulking and taking the wobble out of some recently installed toilets. I looked to Angi's to get some quotes, and Matthew was quick to quote the work and schedule. He was detail oriented explaining what was needed, and very tech savvy being able to provide quotes over email and the app with photos and details compared to others, in my experience, who need to come to the home first and don't seem to follow up well. I got master plumber Zack who was respectful, nice, clean and considerate of scheduling water cut offs with the family's needs. There was another customer emergency, and they were able to finish the work so we had hot water and come back the next day to finish the rest at a convenient time - showing me they really cared about their customers and triaged appropriately given how essential running water is! Highly recommended."

Sara B on July 2025

Locally owned and operated plumbing company focused on residential and commercial installation, service, and repair. Our two Master Plumbers have over 50 years of experience. Let our service exceed your expectation.

"I needed to replace old water heaters and also had some other plumbing work in my home - caulking and taking the wobble out of some recently installed toilets. I looked to Angi's to get some quotes, and Matthew was quick to quote the work and schedule. He was detail oriented explaining what was needed, and very tech savvy being able to provide quotes over email and the app with photos and details compared to others, in my experience, who need to come to the home first and don't seem to follow up well. I got master plumber Zack who was respectful, nice, clean and considerate of scheduling water cut offs with the family's needs. There was another customer emergency, and they were able to finish the work so we had hot water and come back the next day to finish the rest at a convenient time - showing me they really cared about their customers and triaged appropriately given how essential running water is! Highly recommended."

Sara B on July 2025

Reliant Plumbing

Reliant Plumbing

Customers say: Quality work

121 local quotes requested

11 years of experience

We're dedicated to providing our clients with the very best in service, installation, and repair for all phases of your plumbing needs. We specialize in a variety of residential and commercial services and take pride in the attention to detail put into each of the projects we're involved with. We're known for our quality work and the integrity of our business. We look forward to building long-term relationships with our clients, and guarantee your satisfaction.

"DO NOT USE THIS COMPANY. During the process of doing the work, they damaged my property. They said they would fix it, but I called many times and continued to get the run around. Finally they had someone come out to paint, which did not cover the blue dye or fix the issue with the stained flooring or base boards. I have continued to call and been told a manager will reach out, which they never do. I have filed a complaint with the BBB."

Richard S on July 2025

We're dedicated to providing our clients with the very best in service, installation, and repair for all phases of your plumbing needs. We specialize in a variety of residential and commercial services and take pride in the attention to detail put into each of the projects we're involved with. We're known for our quality work and the integrity of our business. We look forward to building long-term relationships with our clients, and guarantee your satisfaction.

"DO NOT USE THIS COMPANY. During the process of doing the work, they damaged my property. They said they would fix it, but I called many times and continued to get the run around. Finally they had someone come out to paint, which did not cover the blue dye or fix the issue with the stained flooring or base boards. I have continued to call and been told a manager will reach out, which they never do. I have filed a complaint with the BBB."

Richard S on July 2025

STAMPORT PLUMBING & UNDERGROUND UTILITIES

STAMPORT PLUMBING & UNDERGROUND UTILITIES

42 years of experience

Free onsite estimate

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business! Book with us online or feel free to give us a call today!

"Great communication, thorough and timely. I highly recommend this service. "

Lois M on August 2025

We pride our company on reliability, great communication, integrity, and quality work. We are experts in our trade and will do our best to keep you as educated as we can on your particular task or project. We look forward to earning your business! Book with us online or feel free to give us a call today!

"Great communication, thorough and timely. I highly recommend this service. "

Lois M on August 2025

Honest Plumbing & Air

Honest Plumbing & Air

Customers say: Quality work

44 local quotes requested

12 years of experience

Honest Plumbing & Air has been providing the best in HVAC and plumbing services to residents across Central Texas. Above all, we operate on the belief that honesty is the best policy. We will take the time to properly assess your specific situation and we will not overcharge you for unnecessary work. You can rest assured that when you call Honest Plumbing & Air, you're getting a professional technician who will be straightforward with you every step of the way. Our team will effectively diagnose your air conditioning, heating, or plumbing problem, without exaggerating the truth.

"Beware! not so honest. I had a air conditioner that would not start earlier this year and while he was here, I asked about having some general maintenance completed at the same time. I was told it could not be done at that time but the tech suggested that I purchase a maint. package that they would come out twice a year to do general maintenance on the units. He stated that they could do in a week or so, it turned out to be over 1-1/2 months for the 1st maintenance but I should clarify that it really isn't much maintenance but a opportunity to pay them to do a quote for additional work. In addition to this, one of our units was not operational arrived, before he would even move a finger I was required to sign a document for work in the amount of around $340 which ended up taking the technician 15 minutes to replace a blown fuse and loose wire, they charged $116.99 for the fuse (cost $0.1469). Not so honest, much different story from when I initially used them several years ago. "

tim h on June 2025

Honest Plumbing & Air has been providing the best in HVAC and plumbing services to residents across Central Texas. Above all, we operate on the belief that honesty is the best policy. We will take the time to properly assess your specific situation and we will not overcharge you for unnecessary work. You can rest assured that when you call Honest Plumbing & Air, you're getting a professional technician who will be straightforward with you every step of the way. Our team will effectively diagnose your air conditioning, heating, or plumbing problem, without exaggerating the truth.

"Beware! not so honest. I had a air conditioner that would not start earlier this year and while he was here, I asked about having some general maintenance completed at the same time. I was told it could not be done at that time but the tech suggested that I purchase a maint. package that they would come out twice a year to do general maintenance on the units. He stated that they could do in a week or so, it turned out to be over 1-1/2 months for the 1st maintenance but I should clarify that it really isn't much maintenance but a opportunity to pay them to do a quote for additional work. In addition to this, one of our units was not operational arrived, before he would even move a finger I was required to sign a document for work in the amount of around $340 which ended up taking the technician 15 minutes to replace a blown fuse and loose wire, they charged $116.99 for the fuse (cost $0.1469). Not so honest, much different story from when I initially used them several years ago. "

tim h on June 2025

Mr. Rooter Plumbing of Austin

12201 Roxie Dr

3.82(

28

)

•

Approved Pro

Mr. Rooter Plumbing of Austin

12201 Roxie Dr

3.82(

28

)

•

Approved Pro

Customers say: Quality work

223 local quotes requested

55 years of experience

Mr. Rooter Plumbing of Austin is standing by to take care of any plumbing issues you might have in your home. Our team is known for being friendly, punctual, knowledgeable, efficient, and clean. Our Austin plumbing services are known for being effective and competitively priced. Keep your home’s plumbing systems in tip-top conditions with the help of Mr. Rooter Plumbing of Austin. With routine maintenance, we can help you avoid major plumbing problems. But if they do happen, our repair services can get us at your door quickly to get things under control, even for emergencies that happen at odd hours and on weekends or holidays! We bring you the best of all worlds when you call on us to work on your Austin home plumbing services. You get the personability and quick turn-around times of a local plumber. But you also get the advanced training and top-grade equipment of a corporate plumbing company!

"It went well. They heiped get the manufacture to replace the heater for no charge. We had to pay for labor but still we didn't have to pay for the heater. Aaron was friendly and did a great job."

Cate S on July 2023

Mr. Rooter Plumbing of Austin is standing by to take care of any plumbing issues you might have in your home. Our team is known for being friendly, punctual, knowledgeable, efficient, and clean. Our Austin plumbing services are known for being effective and competitively priced. Keep your home’s plumbing systems in tip-top conditions with the help of Mr. Rooter Plumbing of Austin. With routine maintenance, we can help you avoid major plumbing problems. But if they do happen, our repair services can get us at your door quickly to get things under control, even for emergencies that happen at odd hours and on weekends or holidays! We bring you the best of all worlds when you call on us to work on your Austin home plumbing services. You get the personability and quick turn-around times of a local plumber. But you also get the advanced training and top-grade equipment of a corporate plumbing company!

"It went well. They heiped get the manufacture to replace the heater for no charge. We had to pay for labor but still we didn't have to pay for the heater. Aaron was friendly and did a great job."

Cate S on July 2023

Expo Home Improvement

13859 Diplomat Dr

4.42(

113

)

•

Approved Pro

Expo Home Improvement

13859 Diplomat Dr

4.42(

113

)

•

Approved Pro

Customers say: Quality work

2924 local quotes requested

19 years of experience

Imagine loving every corner of your home. From a kitchen that feels fresh again, to a bathroom that finally works for your family, to windows that keep you comfortable through every Texas season. At Expo Home Improvement, we make remodeling feel simple and rewarding. Our team brings care, craftsmanship, and clear communication to every project, because how we show up matters just as much as what we build. Whether you're in Dallas-Fort Worth, Houston, Austin, San Antonio, or East Texas, we’re just around the corner and ready to help you love where you live. M-39963

"The Expo home came out, and they installed a step-in shower for the family; their work was excellent. We worked with Da'Monte, Kawin, and John, and they were very professional. We would recommend them to anyone needing this type of service."

Geri H on July 2025

Imagine loving every corner of your home. From a kitchen that feels fresh again, to a bathroom that finally works for your family, to windows that keep you comfortable through every Texas season. At Expo Home Improvement, we make remodeling feel simple and rewarding. Our team brings care, craftsmanship, and clear communication to every project, because how we show up matters just as much as what we build. Whether you're in Dallas-Fort Worth, Houston, Austin, San Antonio, or East Texas, we’re just around the corner and ready to help you love where you live. M-39963

"The Expo home came out, and they installed a step-in shower for the family; their work was excellent. We worked with Da'Monte, Kawin, and John, and they were very professional. We would recommend them to anyone needing this type of service."

Geri H on July 2025

Expo Home Improvement

2548 Shell Rd

4.63(

16

)

•

Approved Pro

Expo Home Improvement

2548 Shell Rd

4.63(

16

)

•

Approved Pro

Customers say: Super punctual

1243 local quotes requested

19 years of experience

Imagine loving every corner of your home. From a kitchen that feels fresh again, to a bathroom that finally works for your family, to windows that keep you comfortable through every Texas season. At Expo Home Improvement, we make remodeling feel simple and rewarding. Our team brings care, craftsmanship, and clear communication to every project, because how we show up matters just as much as what we build. Whether you're in Dallas-Fort Worth, Houston, Austin, San Antonio, or East Texas, we’re just around the corner and ready to help you love where you live. M-39963

"The installers are great I own hvac company for over 30years an I was taught when you do something do it right because your name on that job .I feel the installers did that I'm pickie but didn't have to worry about anything they were just as pickie as I'm on doing a great job"

Sam M on April 2025

Imagine loving every corner of your home. From a kitchen that feels fresh again, to a bathroom that finally works for your family, to windows that keep you comfortable through every Texas season. At Expo Home Improvement, we make remodeling feel simple and rewarding. Our team brings care, craftsmanship, and clear communication to every project, because how we show up matters just as much as what we build. Whether you're in Dallas-Fort Worth, Houston, Austin, San Antonio, or East Texas, we’re just around the corner and ready to help you love where you live. M-39963

"The installers are great I own hvac company for over 30years an I was taught when you do something do it right because your name on that job .I feel the installers did that I'm pickie but didn't have to worry about anything they were just as pickie as I'm on doing a great job"

Sam M on April 2025

OnCall Home Services

12593 Research Blvd

4.35(

706

)

•

Approved Pro

OnCall Home Services

12593 Research Blvd

4.35(

706

)

•

Approved Pro

Customers say: Super punctual

975 local quotes requested

27 years of experience

With over 20 years of experience servicing the Austin area, we strive to provide a wide array of high quality, affordable services. We offer home repair, remodeling, make-readies, custom interior and exterior paint, and many other services. Currently, we have five employees, and use professional and licensed subcontractors. ***We offer free estimates, price matching, flexible payment and financing available as well as.*** Call us today for your home repair and remodeling needs! **$500 minimum for labor on Service Calls**

"On the recommendation of our realtor, we hired OnCall Home Services to remodel the kitchen in our new house. In our previous house, we were burned by a different contractor, so we were a bit nervous entering into this project. Turns out we had nothing to worry about! Beau and his crew were great to work with from the beginning of the project to the end. Whenever we had a question or concern, Beau was prompt to reply or came by the house to discuss. There were no hidden surprises in the costs because Beau was always transparent and kept us apprised about any issues or needed adjustments that came up. He and his crew were courteous, professional, and showed up on time, every day. The project was completed on schedule and we're extremely happy with the results. We wouldn't hesitate to hire OnCall Home Services again for any future house projects!"

Chris K on May 2023

With over 20 years of experience servicing the Austin area, we strive to provide a wide array of high quality, affordable services. We offer home repair, remodeling, make-readies, custom interior and exterior paint, and many other services. Currently, we have five employees, and use professional and licensed subcontractors. ***We offer free estimates, price matching, flexible payment and financing available as well as.*** Call us today for your home repair and remodeling needs! **$500 minimum for labor on Service Calls**

"On the recommendation of our realtor, we hired OnCall Home Services to remodel the kitchen in our new house. In our previous house, we were burned by a different contractor, so we were a bit nervous entering into this project. Turns out we had nothing to worry about! Beau and his crew were great to work with from the beginning of the project to the end. Whenever we had a question or concern, Beau was prompt to reply or came by the house to discuss. There were no hidden surprises in the costs because Beau was always transparent and kept us apprised about any issues or needed adjustments that came up. He and his crew were courteous, professional, and showed up on time, every day. The project was completed on schedule and we're extremely happy with the results. We wouldn't hesitate to hire OnCall Home Services again for any future house projects!"

Chris K on May 2023

Indigo Home and Facility Services

1005 Meredith Dr

4.80(

45

)

•

Approved Pro

Indigo Home and Facility Services

1005 Meredith Dr

4.80(

45

)

•

Approved Pro

Customers say: Quick response

Recommended by 95% of Angi customers

Recommended by 95% of HomeAdvisor customers

529 local quotes requested

Top-Notch Repair and Remodel Services form a Reputed Local Company You can safely rely on our one-stop team of Electricians, Plumbers, and General Repair Technicians to get the job done right. We provide the solutions that work best for your home or facility. As a Texas-based company, we know our local market well and always offer cost-effective solutions. Customer satisfaction is our top priority. Every team member strives to provide top-notch services. https://indigoservices-tx.com/

"Great! Tech was friendly, knowledgeable, and very helpful when questioned about the issue. I will be calling Indigo next time I need any work done around the house."

Kevin H on March 2025

Top-Notch Repair and Remodel Services form a Reputed Local Company You can safely rely on our one-stop team of Electricians, Plumbers, and General Repair Technicians to get the job done right. We provide the solutions that work best for your home or facility. As a Texas-based company, we know our local market well and always offer cost-effective solutions. Customer satisfaction is our top priority. Every team member strives to provide top-notch services. https://indigoservices-tx.com/

"Great! Tech was friendly, knowledgeable, and very helpful when questioned about the issue. I will be calling Indigo next time I need any work done around the house."

Kevin H on March 2025

Excalibur Plumbing

11880 Old 2243 W

4.68(

2,176

)

•

Approved Pro

Excalibur Plumbing

11880 Old 2243 W

4.68(

2,176

)

•

Approved Pro

Customers say: Super punctual

727 local quotes requested

15 years of experience

Serving the Austin metro, we specialize in all plumbing repairs. We have the most reviews in Austin Texas on Angie's list. Top Plumber all A in all categories. Up to 15% off Angie customers- Call us anytime for a free estimate 512-259-7222. FREE ESTIMATES!!!!

"I really needed my outside faucet replaced, it was not working properly and was very hard to turn off, to prevent leaking. I called Excalibur Plumbing and they sent Curtis out to fix my issue. He was very friendly, courteous and easy to work with. I use this faucet a lot in the summer time to water my flower bed and my yard. It's now working better than ever! Thanks Curtis!"

Jerry B on April 2024

Serving the Austin metro, we specialize in all plumbing repairs. We have the most reviews in Austin Texas on Angie's list. Top Plumber all A in all categories. Up to 15% off Angie customers- Call us anytime for a free estimate 512-259-7222. FREE ESTIMATES!!!!

"I really needed my outside faucet replaced, it was not working properly and was very hard to turn off, to prevent leaking. I called Excalibur Plumbing and they sent Curtis out to fix my issue. He was very friendly, courteous and easy to work with. I use this faucet a lot in the summer time to water my flower bed and my yard. It's now working better than ever! Thanks Curtis!"

Jerry B on April 2024

Get matched with top tankless water heater installers in your area

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Tankless water heater installers in San Marcos

Sustainable Plumbing & Air LLC

Sustainable Plumbing & Air LLC

Reliant Plumbing

Reliant Plumbing

STAMPORT PLUMBING & UNDERGROUND UTILITIES

STAMPORT PLUMBING & UNDERGROUND UTILITIES

Honest Plumbing & Air

Honest Plumbing & Air

Mr. Rooter Plumbing of Austin

Mr. Rooter Plumbing of Austin

Expo Home Improvement

Expo Home Improvement

Expo Home Improvement

Expo Home Improvement

OnCall Home Services

OnCall Home Services

Indigo Home and Facility Services

Indigo Home and Facility Services

Excalibur Plumbing

Excalibur Plumbing

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Get matched with top tankless water heater installers in your area

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Matching on HomeAdvisor

Tankless water heater installers in San Marcos

Sustainable Plumbing & Air LLC

Sustainable Plumbing & Air LLC

Reliant Plumbing

Reliant Plumbing

STAMPORT PLUMBING & UNDERGROUND UTILITIES

STAMPORT PLUMBING & UNDERGROUND UTILITIES

Honest Plumbing & Air

Honest Plumbing & Air

Mr. Rooter Plumbing of Austin

Mr. Rooter Plumbing of Austin

Expo Home Improvement

Expo Home Improvement

Expo Home Improvement

Expo Home Improvement

OnCall Home Services

OnCall Home Services

Indigo Home and Facility Services

Indigo Home and Facility Services

Excalibur Plumbing

Excalibur Plumbing

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