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Our staff is trained by Navien for sales, installation and service all types of repairs and diagnose of their products in addition to Bosch installations. Schedule an appointment today for you're a complete survey on how tankless water heaters can save you money and space, have endless amount of hot water. Big City Plumbing & Heating, licensed and insured, servicing Nassau, Suffolk and the 5 Boroughs, Specializing in gas conversion, National Grid and Con Ed Rebates available Residential and Commercial Installations.
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Our service experts will provide a comprehensive written estimate before beginning work on your radiant heating system and we offer a written guarantee on parts and workmanship. Whether you're a current Big City Plumbing & Heating Inc. customer or not, we treat your emergency call like the emergency it is.
There are few things as frustrating as trying to find a heating service company to respond to your emergency needs especially after normal business hours and on weekends. Once you locate a company how do you know that they are qualified, reliable and ethical? Big City Plumbing & Heating Inc. is the name to trust.
Below, you can scroll through our project gallery to see some of our previous installations. On non-mobile devices, just use the arrow on the right or left to scroll through images. On mobile devices, just swipe to scroll through images. Big City Plumbing is the leading installer of Navien's and we are NSS Certified with Navien.
Once again Mike came to my rescue. I called Big City Plumbing after 3 on Tuesday. I had no hot water my tankless water heater just died. Diane was kind and cared about my situation. She connected me with Mike who immediately made arrangements for the guys to come the next day. Benny came and installed tankless heater he explained Ed what he was doing and asked if I had any questions.
Reviews (9)
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David S.
May 28, 2022
Absolutely 5 starts to Big City Plumbing. They did the conversion of the heating and hot water system of my house from oil to natural gas. Mike and Diane are friendly and professional, they were helpful at every step and they took care of all planning and scheduling and answered any questions I had. Everything went smoothly and on schedule. Ben and Shane did a top notch installation.

They removed the old equipment with utmost care, professionally installed the new tankless system. The new plumbing has been done properly and professionally and the new system works great. I highly recommend Big City Plumbing.
Edd Hazell
Apr 11, 2022
This is the best money I've spent on my house, I cannot say how much am happy and satisfied with the install and look from start to finish. The before and after picture say it all. I highly recommend big City Plumbing if you want a clean, professional and beautiful job. Benny and Oshane is the man for the job.
Krissy K.
Nov 27, 2021
I am extremely happy I chose Big City Plumbing to do the oil to gas conversion in my home. I had decided to go with another plumbing company but they could not proceed with the conversion due to health issues. I am so glad the conversion didn't work out with the other company and instead Diane, Benny, and Shane did the work for my house. I could not have asked for a better team.

They knew exactly what to do in such an efficient and knowledgeable manner. Not only are they competent and good people, they give very good quality work. You will have to pay much more from another plumbing company what they provide as standards for themselves. I got what I paid for
Adam W.
Jan 03, 2021
Big City Plumbing recently installed a new Navien combi unit in my home. From the first call with the owner, Mike, I knew I was in great hands. Mike is a complete professional and total expert in the field. He spent a lot of time on the phone with me answering questions and determining the best unit for my home and at a fair price. Benny handled the installation flawlessly. And, they both checked in for days after the installation to make sure my new heating system is running perfectly. Diane who manages the operation was very helpful and even took care of the paperwork for my rebates. Going forward, I will use Big City Plumbing for all my plumbing and heating and AC needs. They earned my trust and respect! You won't be disappointed with the quality of their work!
Andrew MacPhee
Dec 19, 2020
Mike, Benny, Shane and everyone associated with Big City are experienced professionals that do extremely reliable and knowledgeable plumbing and heating work. I am a maintenance manager at a 109 unit mid rise apartment building and I have relied on their expertise for years. They can diagnose and repair any aspect of heating and plumbing that you will come across. Do not hesitate to ask them for help. Thank you guys!
Stacey Thomas Grant
Apr 30, 2020
Thanks to Big City Plumbing, we have heat and hot water, our previous contractor installed our combo heat and hot water unit and it was a mess, a unit that was suppose to last up to 15 years failed in 4 years because they did not install it correctly putting us out of a good chunk of change. But we found Big City Plumbing and it was a complete difference, Edwin was the first person sent out by Big City Plumbing, and to me first impression counts, Edwin was so knowledgeable of the system we needed and the best way to install it, he was polite, friendly and very professional, with that we decided to go with Big City Plumbing and some days later Edwin, Benny and Shawn came to do the new install, again professionalism all the way, friendliness all the way, we could not have been happier with the choice we made of going with Big City Plumbing, they put up our new combo heat and hot water until and streamline our pipings, originally we had pips going all whichever way, but now there was way less pipes and it was neat and cohesive.

Thank you so much Also to Mike and Diane at Big City Plumbing for all the help and advise given you have a friend in us and I'll shout you all name to the roof top, I will refer you to everybody, everybody. Thank you so much and I left pics and a video to show how marvelous your work is Thanks guys.
Karen Scottaline
Nov 05, 2018
Mike and his staff at Big City Plumbing are extremely professional and friendly. Mike is honest and considerate of how your money is being spent. Only work needed or requested by you is what you will receive. The quality of the work is exceptional and your home will be respected by the crew. Benny is a tech-savvy plumber, familiar with today's technology and your equipment will be dialed-in as it should be for the highest efficiency.

If you find a lower price, you will not be getting the same job. When you call, you will likely be greeted by Diane. She is very personable and will guide you in the right direction. Your calls will always be returned. This is a business model that should be emulated by all contractors. Honesty and quality.
Mike B.
May 24, 2018
Big City Plumbing gets 5 stars from us. From the first quote Mike gave to the day we fired up our new Navien 240, our oil to gas conversion was a hassle free process. They were fast, responsive to calls (even now almost a year later), super clean with both their removal and installation work, and all at a great price. Especially when the $600.00 rebate check arrived a few weeks later that Diane had filed for us!

And for those curious I paid 40% less in costs in the year after I went to gas. Plus no smell and a laundry room that has doubled in size. Highly recommend the conversion it pays for itself in 5 years.
Angelo Lee
Jan 28, 2016
I usually do not write reviews but I have to tell you I called Big City plumbing and Diane picked up the phone and was pretty familiar with boiler installations. Mike came over and gave me an estimate with his iPad, showed me seven different installations and gave me a price than emailed me an estimate. The crew showed up about a month later after the gas service was installed by National Grid.

These guys were fantastic covered the floors did the installation what a professional company from start to finish. it was a pleasure working with them if you don't call these guys you'll be sorry. oh one last thing Mike is doing this for 50 years. Angelo