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

"Excellent. Two separate teams came; one for AC and Furnace; second for Tankless hot water heater; Minor toilet repair also done at no extra charge, including a follow up service call to install new toilet flush handle, also at no charge."

"We have depended on Fred and Son for expert plumbing help for years now. Today it was Joe who did the installation, and we couldn't be happier with his work. Equally important, we appreciate how friendly, considerate, and professional he was throughout his visit. We will continue to have Fred and Joe on speed dial!"

"Kap was extremely responsive on the phone to give a quotation with a very compettive price. He arrived on time, and worked effectively to finish and do everything in a professional way. The work quality was excellent and very clean. We are realy happy with the water heater he installed."

"Very thorough. Explained things so I could make an informed decision as to which heat pump to purchase. Courteous, punctual and competitively priced."

"Mr. Rema arrived on time Sunday morning to update my water heater. He installed an expansion tank, duct work and replacing the piping to the thermostat on the water heater. He did an excellent job and took his time. Mr. Rema also went to the local hardware store twice to pick up the material that was needed. The only reason I didn't give him an A was because he quoted me a price at the beginning and then went done on the price and then tried to go back up to the original quoted price. After talking with him he decided to keep the price at the lower amount that he quoted."

"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!"

"Tried to push me into purchasing a new water heater and quoted me higher price based on estimate from their affiliated company (which had accidentally quoted me wrong price initially)."

"Same Day Service-Wow! Well, to my surprise, I found a leak under my hot water heater late Saturday evening, 11/28. In a panic, I called three contractors: the first contractor gave me an appointment for Tuesday, 12/1; I’m still waiting to hear from the second contractor; the third contractor sent me an email with instructions to attach pictures of pipes, hot water heater, the surrounding area where the pipes exit, and label specs. All of this for a free estimate! I slept on it and decided to keep searching because I wanted “instant gratification-job done”! Sunday morning, 11/29, I found “Day and Night Plumber, LLC” 8:20a. The receptionist gave me an appointment for 11a. The technician, Mr. Lal Zaua, was on time with his mask and gloves! He introduced himself, and we exchanged greetings, then went to the basement. He diagnosed the problem. He explained the types of water heaters and gave me pricing, which included a discount. I asked him if he could do it today? He responded yes and “went to work”! To cut down on foot traffic and less contact [because of COVID-19], he always used the back door. When completed, he tested the water, explained the temp controls, and where to turn the water off in case of an emergency. Everything was complete, and he departed at 3p. I am perfectly satisfied! Mr. Lal Zaua was responsive to my needs, treated me and my home with respect, and made sure that I understood everything before he started the job. Thank you so much!"

"Hello, I am requesting assistance from a licensed plumber/gas fitter for gas service restoration at my property: 1239 Maple Ave. Baltimore, MD 21227 BGE has determined that the prior gas service was abandoned and is now processing the project as a new gas service line and exterior meter installation. BGE will be meeting me on-site on Tuesday, June 9, 2026, at 9:00 AM to review and approve the proposed exterior meter location. I need a licensed plumber/gas fitter who can either attend that BGE site visit or come immediately afterward to evaluate the work required on the customer side of the gas system. The scope of work includes: - Inspecting the existing gas piping to determine whether any portion can be safely reused; - Extending, repairing, or replacing internal gas piping as needed; - Establishing the new customer-side gas connection point for the exterior BGE meter; - Pulling the required gas/plumbing permit; - Performing the required pressure test; - Coordinating the requir"

"I contacted Len the Plumber after hours after our hot water heater broke and they came out promptly the next morning and were able to install a new water heater the same day. They were very professional and extremely tidy. It was a pleasure working with Len the Plumber."