Get matched with top tankless water heater repair pros in Frederick, MD

"They did a really great job. Very professional very personable."

"At first, I thought it was a burst pipe from the week + freezing temperatures but I needed a garbage disposal replacement. They were very responsive. Codey, the technician, was very polite and professional. I was referred by a neighbor who has used them for years. I am very pleased with their service. Mary Collins"

"I had a plumbing issue that I thought would turn into a major headache, but Mahon Plumbing made the whole process smooth and stress-free. They arrived on time, quickly diagnosed the problem, and had it fixed before I could even make a second cup of coffee. They were professional, knowledgeable, and even gave me a few tips to avoid future issues. The pricing was fair, and there were no surprises on the bill—just great service from start to finish. If you need a plumber who knows what they’re doing and won’t leave you with a mess, I highly recommend Mahon Plumbing. I’ll definitely call them again for any future plumbing needs!"

"Great service very prompt and easy to work with."

"Jimmy showed up to my home during a time when my thermostat was not working. That issue was fixed. He sold me a services contract and told me when he returned to services the units, he will cover the pipes outdoors. I purchased the contract for twice per year maintenance. I scheduled with him for a specific date. Appointment was confirmed but Jimmy did not show. When I called, he it appears that he forgot my appointment and he rescheduled saying he could not work in the rain. He rescheduled for a few days after and one of his workers showed up (Carlos). The guy showed up looking like he was someone who does not want to work and unprepared. So, I asked him if he has filters and he said know. Jimmy's workman did not bring filter, so I offered him filters I had stored. I asked him if he bought things to cover the pipes at the back, he said no. I called and left a message for Jimmy. Carlos was so rude and unprofessional. I was so scared of him and the way he was behaving. Carlos then said he would NOT do any service. IT WAS A WASTE OF MY TIME. He did return my money. BUT I will not recommend him. Will NOT use him again. As woman I will not hire again. Customer services was poor, reliability and punctuality poor."

"Woke up this morning to my hvac leaking and contacted Markool. I have never used them before and was in a pinch. They fit me right in this morning and were out at my house within 2 hours. The tech stepped in the door and placed covers for his shoes so he did not track in any dirt which was impressive! The tech was very professional and super friendly. Problem was diagnosed and FIXED within an hour. The price was extremely reasonable to the point I was shocked in a good way (expecting a higher price). Anyways, I will most certainly be a returning customer. Thank you Markool Heating Cooling Plumbing."

"Great service!"

"Nice, reliable, and responded immediately."

"They were the first to come out to provide an estimate. They did the work without my approval. The tenant may have "approved" them to complete the work."

Award Winning HVAC, Electrical, & Plumbing Contractor\nOur commitment to training the best team of licensed HVAC and Plumbing technicians and electricians possible and dedicated to outstanding customer service has contributed to our growth and success\n\n“What do our customers want?” It's a question that drives the way we do business every day. We strive to be more than just an HVAC and electrical contractor—our goal is to improve people's lives through better comfort, enhanced efficiency, and greater reliability. We are proudly setting new standards in the Maryland HVAC and electrical market one home at a time! Consider the many reasons why your neighbors love working with GAC.