Tankless Water Heater Installation in San Marcos, TX

Providing Reliable Tankless Water Heater Installations

If you're tired of running out of hot water in the middle of a shower or waiting for the tank to refill, consider upgrading to a tankless water heater. These energy-efficient systems provide endless hot water while helping you save money on water heating bills too!

For a reliable tankless water heater installation in the San Marcos area, look no further than Reliable Air. For more than 20 years, we’ve stayed committed to doing right by our customers. Rest assured that our highly-trained plumbers never cut corners and will get the job done right the first time around.

Benefits of Installing a Tankless Water Heater

  • Endless hot water: Unlike traditional tank water heaters that store a limited amount of hot water, tankless water heaters provide an endless supply of hot water on demand (which is why they’re often called “on-demand water heaters”). This means you won't have to worry about running out of hot water, even during peak usage times.
  • Energy efficiency: Tankless water heaters only heat water when needed. This eliminates the energy wasted on continuously heating and reheating water in a storage tank. This can result in significant energy savings and lower utility bills over time.
  • Space-saving design: Tankless water heaters are compact and wall-mounted, freeing up valuable floor space. If you have a small home, or if the location of your existing water heater has limited space, this can be a huge benefit.
  • Longer lifespan: With proper maintenance, tankless water heaters can last up to 20 years or more. Traditional heaters often need replacement after 10-15 years.

Call Reliable Air at (512) 580-8837 to schedule tankless water heater installation in San Marcos, TX.


  • Reliable Relationships

    Many of our employees stay for 10+ years. So you'll always hear a familiar voice on the phone or see a familiar face at your door.

  • Reliable Scheduling

    With same-day service and 2-hour scheduling windows, you'll get service at a time that's convenient for you.

  • Reliable People

    Since we constantly train our employees, you can be 100% confident that your job will be done right—the first time.

Factors that Determine the Cost of Installing a Tankless Water Heater

The following factors determine the cost to install a tankless water heater:

  • Capacity and flow rate: The size and capacity of your chosen tankless water heater will affect the cost. Larger units with a higher flow rate often come with a higher price tag.
  • The brand and model: The purchase price of your equipment will vary un the brand, model, and features. Higher-end units with advanced technology tend to have a higher upfront cost. However, energy-efficient models will typically provide greater long-term energy savings. This can make up for the upfront investment.
  • Plumbing or electrical modifications: If your home's existing plumbing or electrical systems need to be modified to accommodate the tankless water heater, this will increase your overall costs.
  • Potential gas line upgrades: Tankless water heaters are available in both gas-powered and electric models. Gas units generally require additional installation steps, such as proper ventilation and gas line connections. Depending on your home’s infrastructure, this may impact your estimate.

Count on Reliable Air

Hire us for your tankless water heater installation and you’ll get:

  • Reliable people—We constantly train our plumbers, which means you can trust that all workmanship is done safely, accurately, and to code.
  • Reliable financing—Need help affording your new system We’ve got monthly payment plans for folks with all kinds of credit scores.
  • Reliable relationships—Many employees have been with us for 10+ years. This means you’re likely to hear a familiar voice on the phone or see the same face at your door.

Contact us for an a free in-home estimate for tankless water heater installation in San Marcos, TX. Call (512) 580-8837 to get started!


    They were able to diagnose the root cause and fix an issue that had been a nagging problem ever since the HVAC was installed by another company. 3 years of frustration cured in under an hour!

    Chance S.

    Geoff came to fix our toilet that's been acting up for a couple of weeks now. He did a great job and was very professional. He was very kind and helpful. Thanks again for the great service!

    Michelle M.

    I am very happy with the professional informative technicians and office people at Reliable Air. I HIGHLY recommend this San Marcos company who now does plumbing. Today they installed my new water softener and I am very happy with their service. Thank You Geoff and Cheryl!!

    Lisa R.

    As a contractor myself, I’ve worked with Reliable on several projects in the past. Knowing their quality of work, when I needed work on my own home I knew who to call. Arrived on schedule. Diagnosed to problem and fixed it quickly. Travis was friendly and helpful and answered my questions. I would recommend them to anyone.

    James B.

    Andy was extremely polite, helpful, and transparent. Reliable Air was able to accommodate my crazy work schedule to service my a/c unit. I am super grateful.

    Jennifer S.

    When I called to request service they were able to send someone out that same day. When Edgar arrived he was polite and courteous. He explained what he was going to complete the diagnostics first. He then explained what needed to be done and made sure I understood. It was very appreciated that he gave me time to decide on my repair because it was going to cost a bit of money. He finished quickly and explained the invoice. Great job!

    Esther T.

    Joseph was very knowledgeable and quick to respond. He knew exactly what needed to be fixed and he was right on it. I thank you all for the quick, fast and in a hurry respond you did for my family and I. Especially during this freezing weather. Thank you Joseph for being so kind and understanding. I will use you guys again in the near future!

    Anna A.

    Reliable Air off always does an excellent job of kit cleaning and servicing my air conditioner and heater. I always call them. They will mail you a reminder that it’s time to have it done again and that is very helpful.

    Connie D.

    Our family has been a customer of Reliable Air for a number of years. Our service tech today was Edgar A. he was prompt and very polite. Edgar explained in detail what he would be doing, along with the issue he found in terms that any home owner would understand. I highly recommend their service. Great job Edgar!

    Steve S.

How Our Process Works

1. Schedule Your Repair - We make it easy for you to schedule your duct repair service. Just give us a ring at (512) 580-8837 or use our online appointment scheduler. We offer 2-hour scheduling windows. We will send you a confirmation, so you’ll know when we’re arriving.

2. Notify You Before We Arrive - Your service technician will call you when they’re 30 minutes out. This way, you won’t have to wait around, wondering when they’ll get there.

3. Give You a Price - Prior to your service, your technician will inspect the areas that need repairing. They’ll also provide you with upfront and transparent pricing, so you never have to worry about receiving a surprise bill.

4. Complete Our Work - Once you’ve signed off on the quote, your technician will get straight to work. They’ll also let you know how long the service will take, so you can have peace of mind about how long they’ll be working in your home.

5. Make Sure You're Happy - No matter the job, each member of our team values efficiency and a job done right. To ensure that we lived up to your expectations, we’ll request feedback on our performance after the job is complete. We have a 100% satisfaction guarantee— and we mean it.

Ready for Reliable Service? Fill Out the Form Below or Call (512) 580-8837
  • Please enter your first name.
  • Please enter your last name.
  • Please enter your phone number.
    This isn't a valid phone number.
  • Please enter your email address.
    This isn't a valid email address.
  • Please enter your address.
  • Please make a selection.
  • Please enter a message.