Get matched with top tankless water heater installers in Knoxville, MD

"Very professional. I would highly recommend for repair and installation of new systems."

"Rob was amazing. His prices are fair and he even accommodated me on a Saturday. Work was fast and perfect. I will be hiring him again for any of my plumbing needs"

"The technician was great, thoroughly took his time figuring out what would be needed to complete the job."

"It went well. The install was done in approximately 3 hours; knowledgeable technicians. Our drinking water tastes amazing and resolved hard water problem."

"If you want a reliable job done safely and at a fair price, Rodney is the person to call."

"Our furnace finally bit the dust after 25 years of faithful service. I had TriState do several small repairs and maintenance on it over the years, and they always did a good job. So, when the last service rep told me it was finally beyond repair, we consulted with Comfort Specialist, Darren, who isn't just a salesman, but previously installed and repaired HVAC systems. He took lots of measurements, inspected the old unit and the runs to the outside and upstairs. He took his time making calculations and offered us several options on a new system. TriState uses Daikin furnaces, which are rated in the top 5 furnaces for dependability and efficiency. The price, I thought, compared to my two other neighbors, who also recently purchased new systems, was even lower than I thought it going to be. In fact, my neighbors paid more (by thousands) and have a smaller square footage footprint than my house. We've had the unit now for over a month, and so far, it's great. It is a one-zone system, yet the upstairs will only vary by one or two degrees. This is much better than the old unit. We're hoping this small variance in temperature will also apply when the AC is on in the summer. The installers were very professional, arrived on time and completed the work in a timely manner. I would definitely use TriState again, and will rely on them whenever I need service."

"Although the installation took more than a day, the communication of the installer was excellent. The job required new pipes and an expansion tank, so it was more than installing one piece of equipment. All questions were answered (there were many) and the workmanship met my high standards."

"National water has done a great deal of work for us. When we bought our house in 2001 NWS installed our water purification system any water related needs. I highly recommend them & we will continue to use their services. My husband pays the bills so I'm not sure about the fees but they know what they're doing, professional, friendly & honest."

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I called him in response to a leak coming from the ceiling in my living room -  he responded very quickly. Advised I turn off the water -was not sure which was the main water handle. I took a pic and sent it to him and he advised which one it was. Told me he wasn't sure if he could get by today. But then called me a bit later to advise he would be by that day. He was there for a bit trying to figure exactly where the leak was coming from. Cut a square area to access the pipe then replaced the section where the leak was.

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"Just started working with Markool this summer and they have been fantastic! When I need service, they are so fast and every person we have interacted with has been polite, knowledgeable and personable. We unexpectedly needed to replace our system during a heat wave and they were super. So responsive and quick. I would highly recommend Markool for all of your HVAC needs!"