Tankless Water Heater
BlackRock Plumbing Company provides professional tankless water heater installation, service, and repair in Princeton, TX, delivering endless hot water with energy efficiency that traditional tank water heaters cannot match.
Professional Tankless Water Heater in Princeton, TX
A tankless water heater heats water on demand rather than maintaining a stored tank of hot water around the clock, eliminating standby heat loss and delivering a continuous supply of hot water that a tank unit simply cannot provide once its stored volume is exhausted. BlackRock Plumbing Company provides tankless water heater installation, service, and repair throughout Princeton, TX and the surrounding Collin County communities, handling everything from first-time tankless conversions to replacement of aging tankless units and repair of units experiencing flow, ignition, or temperature issues. John Walsh owns and operates BlackRock Plumbing directly, and tankless water heater work is a service where correct sizing, proper venting, and accurate gas or electrical supply configuration make the difference between a unit that performs as advertised and one that disappoints from the first use. Our plumbers work on a non-commission basis, meaning the unit size and configuration we recommend reflects the household’s actual hot water demand rather than the highest-margin product on the shelf. We are fully licensed and insured on every job. Tankless water heater installation involves gas line sizing, venting design, water supply connection, condensate management for condensing units, and electrical supply confirmation, all of which must be correctly executed for the unit to perform to its rated capacity. BlackRock Plumbing delivers complete, code-compliant tankless water heater service throughout Princeton, TX. We serve Princeton, McKinney, Frisco, Plano, and all surrounding communities within our service area. Call us at (469) 877-7798 to schedule your tankless water heater service.
John has done great work for us on large shower remodel and kitchen faucet and valve replacement. I would highly recommend BlackRock plumbing.
Plumbing repairs were completed as scheduled. Work was completed to satisfactory level.
I had a great experience with John from BlackRock Plumbing. He came out to fix some under-the-kitchen-sink pipe issues and was professional, knowledgeable, and efficient from start to finish. He quickly identified the problem, explained everything clearly, and had it repaired without any hassle. The work was clean, solid, and fairly priced. It’s hard to find someone you can trust with plumbing repairs, but I’d absolutely call him again and recommend him to anyone needing reliable service! Thank you John and so glad to have a great company in Princeton!
John got our issue taken care of in under 15 mins. He was professional and courteous. Thank you so much for taking care of our issue!
John was great. He came out to look at an outdoor fireplace so I could close on this house. He was responsive and provided service and updates quickly. He did a great job and we are good to close. Thank you John!!
John was amazing, he was a true professional and he knew his job. I told him what I thought the issue was and he immediately solved the problem. John was great, very personable. I highly recommend BlackRock Plumbing. A real five star company!!!
John was great, always timely, does amazing work, great prices and was able to fix the problem in my bathtub same day. 10/10 would recommend!
I recently used Blackrock Plumbing and couldn’t be more impressed. From the first call to the completed repair, their team was professional, punctual, and knowledgeable. They clearly explained the issue, provided a fair estimate, and completed the work efficiently. Everything was left clean and working perfectly. It’s rare to find a company that combines quality workmanship with excellent customer service. I highly recommend Blackrock Plumbing to anyone looking for reliable and honest plumbers.
John with BlackRock plumbing showed up after hours to repair a leak that another plumber couldn’t even locate. His response time was great, and his team did a fantastic job. 100% recommend BlackRock Plumbing!!
Big thank you to these plumbers who showed up after hours to repair a leak we could not locate. The after hour fee was very reasonable for what the work entailed!
Wouldn’t work with anyone else - BlackRock provides timely service, in a professional manner, while being reasonably priced & are transparent with their customers from start-to-finish. Give them a call for ANY of your plumbing needs; you’ll be in good hands.
My experience with BlackRock I have to say was one of, if not the best, plumbing jobs we have had done. John was extremely knowledgeable and made it easy for us to understand from start to finish. Although our issue was an unfortunate one... We were so relieved to have the fix be as seamless as it was. If I could do 6 stars I would..
We’ve used John Walsh at Blackrock Plumbing Co. exclusively for about two years, including the installation of a new water heater. He’s been consistently reliable and punctual, fair, and does very high-quality work. He communicates clearly, shows up when he says he will, and I trust his recommendations. If you want a plumber you can count on, John is the real deal. We would be happy to share our great experiences with anyone who needs a personal reference!
Great, prompt service. We called John due to plumbing issues we were having at our business. He came out same day, quickly identified the problem and quickly remedied the issue without any effect to our business operations. A true professional that I would highly recommend for any plumbing needs in Collin county.
John was awesome and knowledgeable about his trade! He’s my plumber forever now! Thanks BNI…..
Out of the quotes I received for my front lawn leak repair, John was significantly lower. I was happy to hire him to do the repair, and he and his team showed up early the next day and finished repair within a couple of hours. Also, he didn't try to upsell products but instead fixed a leak with my water heater for free. And when it is time to change it, I will give him a call, he has my business from now on. [His price for water heater replacement was also lower]. I highly recommend John for your repair, you won't regret it. Get several quotes and you will see John is your best bet. And what he quote you is what you will pay, no surprises.
Today is January 1st and I was not expecting John to be able to come and help us. But he did. He cares about his customers! Plus his work was excellent!
We had a very stressful situation late at night on December 23rd when water started leaking from under our kitchen island. With Christmas Eve approaching, we were worried no one would be able to help and that this would turn into a major repair. We contacted John from BlackRock Plumbing Company late that night, and he came first thing the next morning, extremely punctual and reliable. He was polite, professional, and worked cleanly and carefully. It was immediately clear that he knew exactly what he was doing. He walked us through the entire process, explained everything clearly, and you could tell right away that he would never take advantage of anyone. John fixed our situation quickly and at a fair price, which was such a relief. We are absolutely saving his contact for any future plumbing needs. Thank you so much, John, for truly saving our Christmas Eve!
They were amazing, came out same day and diagnosed the problem immediately. Found a way to get us back with hot water quickly while waiting for parts. Would highly recommend them and will use them again for any plumbing issues.
John is an experienced plumber, he knows what he is doing, a honesty and passionate guy who is worth dealing with! Highly recommend
12/13/2025 visit for a quick repair in our daughters room. John was extremely responsive, punctual in stated arrival (even arrived early), took care of our issue lightning fast, fair prices, and super professional. Would 100% recommend and utilize again, thank you!
Highly recommend BlackRock Plumbing. John was very professional, courteous, efficient, and provided same day service at a fair price to install a new water heater. He answered all of my questions and left everything clean after the job.
If you ever need someone reliable, professional, and willing to go above and beyond, John Blackrock Plumbing is the one to call. 🙌 Highly recommend!
I had a great experience with BlackRock Plumbing they were punctual, courteous, and professional from start to finish. Their technician quickly diagnosed the issue and fixed it efficiently, explaining what needed to be done in plain language (which I appreciated). The price was fair and what they quoted up front — no surprises. Afterward, they left the work area clean and even offered some helpful maintenance tips. I’d absolutely use them again and recommend them to anyone in need of reliable plumbing service in the area.
Best customer service I have ever received John at black rock plumbing company in the MAN FOR ANY OF YOUR PLUMBING NEEDS !!!
John was amazing!!!!! If you need any plumbing work done BlackRock Plumbing Company is who you need to contact! Very pleased!!!
Ive worked with John for years and he has always been extremely reliable. I send his info to all of my contacts who need plumbing work.
I needed an emergency repair on a suspected gas line leak near my furnace, and BlackRock Plumbing (Princeton/Fairview) responded incredibly fast. Their plumber was at my Fairview home quickly, performed an accurate leak detection, and completed the necessary gas pipe repair with expertise. They ensured the area was safe and up to code before leaving. The plumber was also knowledgeable!
Amazing Tankless Conversion! BlackRock Plumbing (Princeton, TX) provided excellent service! They seamlessly swapped my old Rheem tank water heater for a new Rinnai tankless unit. Professional, clean, and the plumber was knowledgeable. A massive upgrade for my home. Highly recommend BlackRock Plumbing and their plumbers. — Blake (McKinney Customer)
Had a pleasant experience, John provided me experience and confidence
I was putting off this issue for so long, but John came to unclog my sink and did an awesome job. He was super professional, knew exactly what he was doing, and got everything fixed so quickly. He also took the time to explain what was going on, which I really appreciated. Great experience overall — definitely recommend BlackRock Plumbing Company!
I had an excellent experience with black rock Plumbing Company. From start to finish, their service was professional, efficient, and incredibly friendly. John arrived on time, quickly identified the issue, and explained everything clearly before starting any work. John was skilled, respectful of my home, and made sure the area was clean before leaving.
John (the owner) came out last minute to unclog our backed-up sink and did an excellent job. He was knowledgeable, professional, and communicated clearly the whole time. The price was very reasonable too. Highly recommend BlackRock Plumbing in Wylie, TX for plumbing repairs — Thanks again John!
John is a great business man and and plumber. If you're looking for a pro, you should definately call him. His work is excellent and he values his customers. I would recommend him!
Thanks John is fantastic! He arrived at 7am sharp as promised on a Saturday. He was the only one who could come out, as other companies had a wait time till Monday to Wednesday the next week. Way too long. Our tankless water heater had no hot water and John troubleshooted and resolved the issue in a short amount of time. He even drove a ways to pick up the part that was unavailable at open business locations til Monday. We now have hot water! I highly recommend John and his company, as he’s very cordial and professional. He’s a very nice successful young man. He is to be commended and I have him saved for any future reference related to plumbing, etc. and more. Outstanding work thanks John! We appreciate it GREATLY. It was a true emergency resolved in a timely manner that same morning.
Excellent service! Came on short notice and was very kind. Would highly recommend this company to anyone with plumbing issues.
We were pouring a new concrete driveway and needed to excavate the old one. We discovered that our water supply pipe was embedded in our 80 year old driveway when the pipe was pulled up along with the driveway. The broken pipes and leaking water was going to stop our 12 man team from working on our project. John of BlackRock Plumbing was able to arrive with in an hour to quickly assess the situation. He went out to acquire the parts he needed and very capably fixed the broken pipes. Our project was back on track. Thank you John for saving the day!
John was super knowledgeable and same day service was exceptional. Highly recommended.
Very pleased with his work, on time and very cost efficient. I will recommend to my family and friends for future needs
John did a great job fixing our drains and checking our kitchen plumbing. He was available immediately, and we are very pleased with the quality of his work.
I would recommend BlackRock plumbing to anybody in Princeton. Anybody around Princeton? Thanks John
BlackRock Plumbing did a great job they were here within an hour after calling. They did a great replacing my toilet flange and resetting my toilet. No more smell!!
John is absolutely fantastic!!! I used him in the past for a water heater replacement and today for a cartridge replacement for my master shower. He is highly professional, knowledgeable and skilled at his craft. Very respectful, takes off his boots to keep my house clean, great communication on arrival time and status of work. He tells you his price upfront and sticks to it, and at the end of the job, you never knew that he was ever there. Very clean, neat and a great job!!! He is the only plumber I will ever use. Thanks so much John!!!!
During some home renovations, I broke water pipe and had water spraying everywhere. I called John at BlackRock and he was out in 20 minutes! On a Saturday evening no less. Prices were very reasonable and he got the work done quickly, cleanly and in a very professional manner. I honestly couldn't have had a better experience, BlackRock saved my weekend.
I had such a great experience with this plumber. From the moment he arrived, he was polite, respectful, and very kind. He took the time to explain what needed to be done in a way that was easy to understand, and I never once felt rushed or like he was just trying to get in and out. He worked carefully, made sure everything was fixed properly, and even checked back over his work to be sure it was perfect! I won’t hesitate to call him again or recommend him to friends and family.
I'm so glad I called him. Exceptionally nice young man. On time, fixed the leak and his services were affordable, especially for an old lady on a fixed income. Without any hesitation, I highly recommend BlackRock Plumbing. Should I ever need plumbing services again, I've got him in my list of contacts.
Great service! They were quick, professional, and fixed the problem right the first time. Highly recommend!
The black rock plumbing is te best I truly recommend the service provided by someone certified by the state of Texas. It gave me a lot of confidence, not to mention the quality of his work, which is exceptional. 5 stars
John and BlackRock Plumbing is the best! Highly recommend their services. We used him for 3 issues that we were having with our shower, our sinks, and our outside drain. By sending him a few pictures and brief descriptions, he arrived on time and prepared and repaired all our issues in an efficient manner, and at a fair price. Hoping we don't have any future plumbing issues, but if we do, we will be using BlackRock. We are also planning to use their services on a Commercial project in Princeton later this year. Thank you John.
Where We Offer Tankless Water Heater Services In The Dallas-Fort Worth Area
BlackRock Plumbing proudly provides Tankless Water Heater services in Princeton, TX and the surrounding communities within our 25-Mile service area. View our full service area below:
View All Of Our Plumbing Services
At BlackRock Plumbing Company in Princeton, TX, our licensed plumbers handle Tankless Water Heater and other important plumbing repairs and services. Check out our full list of plumbing services below:
YEARS OF EXPERIENCE
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Tankless Water Heater Service
Tankless water heaters, also called on-demand or instantaneous water heaters, heat water only when a hot water fixture or appliance is opened, passing cold water through a heat exchanger that raises the water temperature to the set point before it exits the unit toward the fixture. Because no stored volume of hot water is maintained, there is no standby heat loss from a tank radiating heat to the surrounding space between uses. The energy efficiency advantage of a tankless unit over a traditional tank water heater comes entirely from eliminating this standby loss, which represents a meaningful portion of the total energy cost of water heating in a typical household. A tankless unit that is correctly sized for the household’s simultaneous hot water demand delivers water at the set temperature continuously for as long as the fixture is open, without the recovery wait that follows exhaustion of a tank unit’s stored volume. The practical benefit of continuous hot water supply is most apparent in households with multiple simultaneous hot water users, in homes with soaking tubs that require more hot water than a standard tank can deliver in one fill, and in households that run out of hot water regularly with their existing tank unit. BlackRock Plumbing assesses each household’s hot water demand profile before recommending a tankless unit to confirm the selected unit will meet those demands under real operating conditions.
Gas-fired tankless water heaters are the most common type in residential installations throughout North Texas because natural gas is widely available and gas-fired units can deliver the high BTU input needed to heat large volumes of water quickly enough to meet whole-home demand at a single unit. A whole-home gas tankless water heater typically requires between 150,000 and 199,000 BTU per hour of gas input at maximum flow rate, which is significantly higher than the 40,000 to 50,000 BTU input of a standard tank water heater. This high gas demand has important implications for the gas supply line sizing; the existing gas line serving the water heater location in a home with a tank unit is almost certainly undersized for a tankless replacement. A dedicated gas supply line sized for the tankless unit’s full BTU demand, typically three-quarter inch or one inch depending on the run length and total system load, must be installed as part of the tankless conversion. The gas meter capacity must also be sufficient for the tankless unit’s demand in addition to all other gas appliances in the home operating simultaneously; in homes at the limits of their meter capacity, a meter upgrade request to the utility may be required. BlackRock Plumbing performs the gas supply assessment and sizing calculation for every tankless water heater installation throughout Princeton, TX before any equipment is specified or ordered.
Why Hire a Licensed Plumber for Tankless Water Heater in Princeton, TX
Tankless water heater installation and service involves gas line sizing, venting design, condensate management, water supply connection, and electrical supply confirmation that interact in ways making licensed professional service the only reliable path to a unit that performs correctly and safely. A gas supply line that is undersized for the tankless unit’s BTU demand produces a unit that cannot reach the set temperature under full flow demand, delivering disappointingly low output temperatures during peak use. A venting system that is incorrectly sized, improperly terminated, or made from the wrong material for the unit’s exhaust temperature creates combustion safety concerns and warranty violations that make the installation both unsafe and unwarranted. A condensate drain line that is incorrectly sloped or unprotected from freezing causes unit faults and potential condensate overflow damage. Descaling performed without the correct equipment and solution concentration fails to fully remove scale from the heat exchanger passages, providing a false maintenance record that the manufacturer will not accept as warranty compliance evidence. Texas-licensed plumbers carry the training, code knowledge, and equipment to address all of these components correctly on every tankless installation and service visit. At BlackRock Plumbing, our non-commission plumbers recommend the tankless unit and configuration that the household’s actual hot water demand requires, with honest guidance on sizing, fuel type, and whether a tankless conversion is the right choice for the specific property. Licensed, insured tankless water heater service backed by complete commissioning and testing is the standard we deliver on every job throughout Princeton, TX.
BUILT ON HONESTY & INTEGRITY
At BlackRock Plumbing, we believe trust is the foundation of every successful service call. Our team focuses on clear communication, honest recommendations, and plumbing solutions that truly solve the problem.
FAMILY OWNED BUSINESS
BlackRock Plumbing is proudly locally owned and based in Princeton, TX. Our team understands the needs of homeowners in the community and takes pride in providing dependable plumbing services with honesty.
ATTENTION TO DETAIL ON EVERY JOB
Every plumbing repair or installation we complete is performed with careful attention to detail. Our team focuses on doing the job properly the first time so homeowners can avoid repeat plumbing issues.
Most Common Tankless Water Heater Questions
Tankless water heaters generate a wide range of questions from homeowners who are considering a conversion, dealing with a performance issue on an existing unit, or comparing tankless to traditional tank options. The answers below cover what our team at BlackRock Plumbing hears most often from customers throughout Princeton, TX and surrounding communities.
Get The Top Tankless Water Heater Near You
Call BlackRock Plumbing Company at (469) 877-7798 for professional tankless water heater installation, service, and repair in Princeton, TX and the surrounding communities, or book a free callback reservation today.