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Top-Rated Tankless water heater installers in San Marcos - Updated Nov 2026

Avatar for Excalibur Plumbing
Excalibur Plumbing
4.7(
2,230
)
Tankless Water Heater - Install

Serving San Marcos, TX and surrounding areas

Approved

In business since 2010

Free estimates

Warranties offered

"EXCELLENT CUSTOMER SERVICE Eddie visited our house the very day we called about our water heater. He came out, inspected the very tough location where the water heater is located and delivered an estimate with 3 options on the spot. We decided which direction to go and let Eddie know at which time he promptly scheduled our installation. On the day of install he arrived when he said he would, put down every type of floor protection you can imagine and proceeded the very difficult task of manipulating a 50 gallon water heater out of a small closet 10 feet up in the air. He worked with his partner to remove the old one, replumbed and installed the new one, again in a very tight space. Eddie ran all new venting to the outside, added electronic monitoring, and crawled under the house several times to make certain the drains were all functioning properly. We could not ask for better service and the attention to detail was amazing. This is our second experience with Excalibur Plumbing and they have both been wonderful experiences. Great customer service!!!!"
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+5

Response time1 day
Recommended by92%of homeowners
Avatar for 5 Mile Plumbing Company LLC
5 Mile Plumbing Company LLC
5.0(
7
)
Tankless Water Heater - Install

Serving San Marcos, TX and surrounding areas

Approved

In business since 2025

Warranties offered

Small jobs welcome

"On 10/27/2027, I had to find a plumber to repair my water heater that had stopped heating water. I went online to Angi?s website and received 3 different plumbing companies in the Austin, TX area. One of the companies was 5-Mile Plumbing Co. The owner of the company, Elvis Bernal, contacted me. We discussed the issue with the water heater. Mr. Bernal gave me his assessment and provided me with a bid proposal on the cost of the repair. Mr. Bernal came to our house the next day and immediately started work on the water heater. I watched Mr. Bernal from a distance and asked questions regarding the procedure. Mr. Bernal went out of his way to answer my questions. During his work, Mr. Bernal also saw something else that needed replacement on the water heater and immediately left the house to go purchase the part. Mr. Bernal replaced the part, continued the repair and verified one of the heating elements had gone out. A new heating element was installed and Mr. Bernal ?bled? the"
Avatar for Garrett's Plumbing
Garrett's Plumbing
5.0(
33
)
Tankless Water Heater - Install

Serving San Marcos, TX and surrounding areas

Approved

In business since 2015

Free estimates

Warranties offered

"Garrett’s Plumbing was a life saver. I have a copper waterline on the ice maker of my old refrigerator. No delivery company wanted to install the new refrigerator because of the copper waterline. Garrett’s plumbing came, assessed and fixed the problem. Now I’m just waiting for delivery of the new refrigerator. Thank you Garrett’s Plumbing."
6 neighbors recently requested a quote
Avatar for Daniel's Plumbing and Air Conditioning
Daniel's Plumbing and Air Conditioning
4.4(
78
)
Tankless Water Heater - Install

Serving San Marcos, TX and surrounding areas

Approved (Corporate)

In business since 2005

Emergency services offered

Credit card accepted

"I purchased a home in Cedar Park and needed a new water heater and other small plumbing repairs done. I saw Daniel's Plumbing advertisement on HomeAdvisor, so I decided to call him. I'm so glad I did! Daniel is very knowledgeable, professional, and a genuinely nice guy. His work is A+ and the price for the work done is very fair. I highly recommend Daniel's Plumbing, LLC for all your plumbing needs!"
Plumbing
Response time1 day
Recommended by95%of homeowners
Avatar for Reliant Plumbing
Reliant Plumbing
4.2(
23
)
Tankless Water Heater - Install

Serving San Marcos, TX and surrounding areas

Approved

In business since 2012

Free estimates

Emergency services offered

Reliant Plumbing is your trusted local plumbing company serving Austin, Waco, and communities throughout Central Texas. We live and work in the communities we serve, providing a full range of residential and commercial plumbing services to homeowners and businesses across the region.\n\nWe understand the unique plumbing needs of Central Texas, from the local climate and soil conditions to the plumbing challenges found in both newer and older homes. Our team is committed to providing high-quality plumbing repairs, honest service, and an exceptional customer experience.\n\nWe stand behind the work we do and strive to earn the trust of every customer we serve. When you choose Reliant Plumbing, you can count on quality workmanship, dependable service, and a team that treats your home like our own.

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+13

Response time10 mins
Response rate100%
22 neighbors recently requested a quote
Abundant Plumbing
5.0(
5
)
Tankless Water Heater - Install

Serving San Marcos, TX and surrounding areas

Approved

In business since 2025

Free estimates

Credit card accepted

Abundant Plumbing is a locally owned plumbing company proudly serving homeowners across Austin and nearby communities. Our team is built on generations of plumbing knowledge and a strong connection to the neighborhoods we work in every day. Founded by Alec & Vanessa Barrera, a fourth-generation plumber, the company continues a family tradition of skilled workmanship and honest service that has been passed down through decades of hands-on experience. \n \nAlec brings more than twenty years of field experience to every project and leads the company with a clear purpose. His goal is simple. Provide dependable plumbing solutions while treating every home with the respect it deserves. With a Responsible Master Plumber license and OSHA certification, our work reflects both professional training and real world knowledge gained through years of serving customers.

9 neighbors recently requested a quote
Avatar for Fox Service Company
Fox Service Company
3.5(
26
)
Tankless Water Heater - Install

Serving San Marcos, TX and surrounding areas

Approved (Corporate)

In business since 1972

Emergency services offered

Warranties offered

Your trusted advisers for AC repair, furnace repair, plumbing and electric in Austin, Texas. \nFox Service Company is a local heating and air conditioning, plumbing and electrical company that has been in existence since 1972. As a family oriented company, we employ local team members committed to providing the highest quality service. We service the greater Austin, TX, Metro area, including all of Georgetown, San Marcos and Round Rock, Texas.

Rooftop Package Unit Installation
Ductless Heat Pump Installation
Ductless Air Handler Installation
Ductless Air Handler Installation
Condenser Replacement

+2

Response time1 day
Response rate90%
4 neighbors recently requested a quote
Avatar for Prostar Water Inc
Prostar Water Inc
4.8(
262
)
Tankless Water Heater - Install

Serving San Marcos, TX and surrounding areas

In business since 1996

Free estimates

Credit card accepted

"It was a pleasure to work with Justine from Prostar Water Inc. She was on time and provided a competitive quote. She was patient in explaining the different options I have. Definitely would highly recommend her."
Recommended by97%of homeowners
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