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

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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.

