Plumbing Services

Hot water anytime.

Princeton Air can make it happen. 609-799-3434

Zip Code

Water Heater Maintenance

Regular periodic water heater maintenance can significantly extend water heater life and minimize losses of efficiency that occur over time. Routine maintenance involves steps such as: Checking the Temperature and Pressure (T&P) relief valve for proper operation; inspecting the burners (in gas models) or heating elements (in electric models); draining & flushing the tank to prevent sediment buildup in the tank bottom; and inspecting the anode rod for corrosion.



redi hot heating system

REDI-HOT (Demand Hot Water Recirculating System)

Demand recirculating pumps have the potential to solve the problem of a long wait for hot water at a distant fixture, while simultaneously saving a significant amount of water - as much as 15,000 gallons/ year in an average home - thereby saving you a significant amount of money.

You no longer have to send cold water down the drain while waiting for warm water. Instead, recirculating pumps rapidly pull hot water from a water heater, while simultaneously send cool water from the hot water lines back to the water heater to be reheated and reused. Demand systems can be controlled by the push of a button, a timer, or motion sensor.

How it Works. In a conventional system with a central water heater, any cold water standing in the pipes between the heater and the point-of-use is dumped down the drain as hot water travels from the heater.

However, in a demand recirculating system, when the system is activated the pump starts recirculating cooled water that's been sitting in the hot water line and sends it back to the water heater through the cold water line. When the water reaches a desired temperature a control turns off the pump. This process is similar to turning on the hot water faucet and letting the water run until it gets hot, but instead of the water being wasted going down the drain, it is simply returned back to the water heater—saving all of that water for later use.

The potential benefits of having a demand recirculating system installed in your home or business are obvious, and far outweigh the initial investment required; so whether you want to include this system as part of your next new construction or home retrofitting project, or simply add it to your existing hot water system, talk to the Pros at Princeton Air & let us help you every step of the way.

With a Licensed Master Plumber on staff, not only can we offer Water Heater and Boiler Installation, Repair & Maintenance Services, but also peripheral products & services that will further increase your peace of mind, such as energy & water-saving devices, emergency water leak detection & shut-off devices, installs & repairs of sump pumps to help your home avoid flooding, and BIY/DIY installation services.

water heater hooked up to furnace

Water Heaters

From washing dishes and showering to doing laundry and more, you and your family use a lot of hot water at home, and as such your home needs to have a steady supply of hot water; but you also don’t want that hot water to cost you a small fortune to produce For these reasons and more, Princeton Air offers and installs some of the highest-output & highest-efficiency water heaters available today to ensure you always have access to the hot water you need, and at a reasonable cost as well.

Storage water heaters heat and store water in a tank that can range in size from 20 to 100 gallons. They offer a ready reservoir of hot water, although “standby” energy losses are higher than with some other types. Conventional fuel sources include natural gas, electricity, propane, and fuel oil.

High-efficiency gas storage water heaters employ the same technology as standard gas storage water heaters: a glass-lined steel tank is heated by a burner located at the bottom of the tank. But a few basic changes make them operate more efficiently. Many ENERGY STAR certified models simply have better insulation, heat traps, and more efficient burners, improvements that have a modest impact on price lead to 8% less energy use. Some very high efficiency models use a secondary heat exchanger that extracts more heat from the combustion gas, cooling it to the point where there is condensation– hence these types of heaters are called “gas condensing.” These gas condensing water heaters, like gas condensing furnaces, require venting through a vertical PVC pipe and a condensate drain.

Standalone water heater

Electric Heat Pump water heaters are electric storage water heaters that are two to three times as efficient as conventional electric resistance units. Because they remove heat from the surrounding air, they are most effective in warmer climates; but because they also have the ability to switch from Heat Pump mode to traditional electric mode, even in colder climates like that of central New Jersey, they make for a cost-effective & reliable alternative to an electric-only model.

Tankless water heater

Tankless Water Heaters

On-Demand (a.k.a. “Tankless”) gas water heaters apply the same principle to heat water as standard gas water heaters, but without a storage tank. They save energy by heating water only when needed, eliminating energy lost during standby operation. When a hot water tap is turned on in the home, cold water is drawn into the water heater. A flow sensor activates the gas burner, which warms the heat exchanger. Incoming cold water encircles the heat exchanger and leaves the heater at its set-point temperature. Combustion gases safely exit through a dedicated, sealed vent system. By heating water only when needed, instead of maintaining a tank full of hot water at all times, on-demand water heaters can achieve a much greater efficiency than standard tank-type water heaters.

Many on-demand gas water heaters employ a secondary heat exchanger to use 9 percent less energy than a conventional on-demand gas water heater. The secondary heat exchanger extracts more heat from the combustion gas, cooling it to the point where there is condensation – hence these types of heaters are called “gas condensing.” These gas condensing on-demand water heaters, like gas condensing furnaces, require venting through a vertical PVC pipe and a condensate drain.

Drawing, showing the basic overview of a gas water heater

WAGS Valve Installation & Service

WAGS stands for Water and Gas Safety valve. The WAGS valve is designed to shut off the water supply (plus gas supply for gas-fired heaters) in the event of a water leak from a water heater, thus minimizing potential water damage and possible gas leakage. The valve can be installed on all styles of water heaters. The valve is fully mechanical, yet requires no external power supply.

The WAGS valve sits in a drip pan under the water tank and is activated when leaking water accumulates in the pan. Once activated, the valve shuts off the water and gas supply, indicated by a red pop-up tab.

Sump Pumps

A damp or flooded basement can be detrimental, leading to serious structural and health issues. Sump pumps are used to pump out excess water that accumulates in a sump basin, usually located in the basement of a home. A sump pump can help your home avoid flooding and other moisture problems. Many sump pumps even have backup power options in case of a power outage; so whether battery-backup powered or city-water powered, the professionals at Princeton Air can help you select the best-suited option for your home, as well as provide any service or repair that might be needed in the years to come.

BIY / DIY Assistance Services

a very confused man... extremely confused.

We are often asked by our clients if we would be willing to provide installation services for something they bought themselves; and occasionally we get the request for our experts to provide repair and/or reinstallation services on products that the clients installed themselves – or tried to at least, with less-than desired results. For many reasons we have always answered these requests with a simple but sincere “thank you, but no thank you”; but as the Buy It Yourself (BIY) and Do It Yourself (DIY) segment of the market continues to grow & evolve, so must our willingness to work with clients in addressing their requests for our assistance with their personal projects, and as such we are adjusting our long-standing policy regarding getting involved in BIY/DIY projects, but only as it relates to plumbing & not inclusive of self-purchased water heaters, boilers or other “major components” – some things should just be handled entirely by professionals!

SO; whether it is to install the faucet you bought online, or repair the toilet that you tried (and failed) to repair – if you would like to discuss taking advantage of our expert, professional help, please don’t hesitate to contact us as your next convenience, and let’s talk about it!

Princeton Air: Your Local Water Heater & Plumbing Professionals

Since 1971, Princeton Air has been offering homeowners in the central New Jersey area water heaters from top brands like A.O. Smith & Bradford White; and with the 21st century popularity explosion of on-demand (tankless) options, Navien has been our go-to product line. Now with the expansion of our Plumbing services, Princeton Air can once again be first & foremost in your mind when you reach for the phone & call for help in addressing more of your home or business comfort-related needs.

Contact us today to schedule an appointment for your hot water heater or sump pump!

Don’t just take our word for it, see what our customers have to say about our exceptional service!

  • Quality workmanship and premier customer service are hallmarks of Princeton Air in NJ. In the last 12 months I replaced two Lennox central air conditioners with new Lennox units and due to Hurricane Irene a new Lennox furnace. I have spent over 20K… Read more


  • I want to let you know that I had a chance to inspect the work you guys did for Pat Palmer and Mark Widmer. When I replaced a bathroom fan for them, I had to remove some drywall from their bathroom ceiling where Princeton Air had installed dense…

    Read more


  • The house is performing wonderfully. The gas usage for November and December was 247 therms. The gas usage for last December alone was 248 therms. The family room, where we spend a lot of our leisure time, is much closer to the temperature of the… Read more


  • Princeton Air personnel provided us with an energy efficient heating/air conditioning system that worked without current heating challenges. We were very happy with the service. The installers showed up on time and were clean and courteous and they… Read more

    Vicki, Lawrenceville

  • Princeton Air and Eric saved us from another cold night. You were there when PSE&G was not. Thank you.

    Susan, West Windsor

  • Technician was cordial, polite, & professional.

    Suzanne, Skillman

  • I just wanted to say how impressed and extremely happy I was with Princeton Air. The professionalism, courtesy, and the attention to detail of Matt, Jimmy, Nelson, and Wes was both refreshing and much appreciated. I noticed that Princeton Air used… Read more

    Bode, Princeton

  • Returned home at 5:00PM last evening after being away for 2 plus weeks to find the furnace completely shut heat, 48 degree temp in the house. Asked if someone could get there that evening and was advised that Eric, a Service Tech, was…

    Read more

    Mike, Princeton Junction

  • Sam got the bat out of my air conditioning vent in the master bedroom! Never complained. He also spotted a clogged pipe leaking in the attic from the unit. Replaced it quickly. Nice guy. Courteous and friendly. I appreciated his cheery demeanor… Read more

    Linda, Hopewell

  • We experienced a warranty issue that caused my ceiling to become water damaged, Sean's ability to stay calm helped me to calm down as well. I think it was his polite demeanor that caused me to remain a customer of your Company.

    Dawn, Lawrenceville

  • Milton called on us today to do an annual service on our air conditioning system. I found him to be very competent and knowledgeable. He worked quickly, but he explained things as he worked and gave me good advice. He was very thorough and…

    Read more

    Robert, Princeton

  • Regarding Paul, Jason, and Mark - Princeton Air is a wonderful company. We really appreciate all they did for us.

    Jim, Princeton Junction

  • I have been more than pleased with your technician, Mike. He is always very professional and allows me to call him directly to place a service call. He always responds to the service calls in a timely manner and is wonderful in dealing with the… Read more

    Mary, Lawrenceville

  • I just wanted to let you know how pleased I was with one of your techs Eric. I had a scheduled visit today and Eric was on time, very personable, and explained everything he was doing thoroughly. Eric is a fine representative of your company.…

    Read more


  • This is my first time using your service and I want to compliment you on your good personnel. Its a really fine service that you have. I would love to have Milton back again if I can.

    Joseph, Hamilton

  • I just had Eric leave my house and as I'm sure you know, this guy is amazing. I've had a lot of service people in my house and he comes in and cleans up after himself, is respectful, and polite. He asks if I have any questions and always gives me… Read more

    John, Princeton Junction

  • Thanks for the info, and thanks for bringing the job to completion. Marty and Marcel took care of business, and were happy campers. It was too cold (below 45 F) for the heat pump to fire, but I'll wait for a warmer day and keep an eye on it. The 7… Read more

    Pat & Toni, Princeton

  • Everyone has been extremely helpful, patient, knowledgeable, and competent. No matter who answers the phone, I am confident that my request issue will be promptly attended to with total professionalism. Whenever someone comes to the house to provide… Read more

    Loren, Lambertville

  • The technician did an excellent job. He was not only really good with the work that he did, he cleaned up and didnt take anything lightly, which I really appreciated.

    Kate, Yardley

  • The professionalism and expertise that I encountered from Kevin made me fully satisfied with this past Saturday's scheduled service. He explained in detail how my system works, he also pointed out the root cause of a problem I had been having and… Read more

    Bob, Princeton

  • This letter is commending Sean. Yesterday, he came to check the furnace at my home. He is efficient and his explanations are clear. He remembers where everything is, and I absolutely trust his work. Its very nice to know that I can rely on Sean. I… Read more

    Elizabeth, West Windsor

  • I just wanted to call to comment on Brennens performance. He came out to service my unit. Brennen was very professional and very knowledgeable. Thank you.

    Theodore, Hopewell

  • I just wanted to call in to say what a wonderful job Nick did over the weekend. I was amazed by the amount of time that he spent in the heat and humidity to get the unit running. I am thankful to Nick and the entire company that I had A/C over…

    Read more

    Leonore, Lawerenceville

  • Part of the reason why I stick with your company is because of Sean. He takes time to explain things to me and he helped me decide which new system to get last year. He is a real asset.

    James, Robbinsville

  • You guys were the first company to figure out how to replace the units here at Governors Lane as built. Congratulations. Chris et al. were great to work with. Thank you.

    John, Princeton

  • Eric handled himself very professionally and took the time to listen to me. Because of his sincere interest, will be preparing a proposal to substantially upgrade our system. He seems to know his profession well and handled me in the right manner.… Read more

    Vaughn, Pennington

  • I just wanted you to know that Rich is a very pleasant, professional and courteous person. All of your employees that have come here are the same. You guys must be doing something right.

    Linda, Morganville

  • Brennan performed the seasonal service on our A/C unit. We were very impressed. He took care of everything very efficiently and completely. He also quickly solved a potential problem. This is to commend Brennan for his fine work and his excellent… Read more

    Melvin, Lawrenceville

  • You have some great people working there. They are fantastic especially Jack and Eric.

    James, Skillman

  • On February 26, 2007 I experienced the frightening experience of having my gas carbon monoxide detector go off. I cannot say enough to the diligence and professional manner Eric demonstrated while trouble shooting. His persistence, expertise, and… Read more

    Doris, Plainsboro

  • Your guys have always been good, but these two men (Geoff and Rich) were the most polite, professional, and personable I've had. They represent your company very well.

    Janet, Monroe

  • Wanted to let you know that Eric performed yet another excellent maintenance on my contract. He has an excellent positive attitude coupled to a get it done right work ethic. It is a pleasure to have him here to take care of things. I never thought… Read more

    Jon, Cranbury

  • I am writing this letter to you to thank one of your employees. Paul noted a pin-hole leak on the side of the main water line that enters the building switchgear room. Had it not been for your conscientious employee, the consequences could have…

    Read more

    Robert, Cranbury

  • We returned home from a one week vacation to Aruba, at about 10:30 pm, to a 50 degree home. We had no heat. We called Princeton Air and the Service Rep was at our home within 25 minutes. Sean fixed the problem quickly. That is great service. You… Read more

    Frank and Mary, Lawrenceville

  • Yes, Mr. Needham my name is Samuel, I live in Hamilton, New Jersey and I just wanted to commend your staff, mainly Shelby and then the guys who came out over the last week. I was having a huge problem with my air conditioner, you guys ending up… Read more


  • Scott, my name is Jean. Princeton Air was here to see me at One Marcom. You sent a representative and he was exceptional, beyond exceptional. I was very pleased with the service and he wouldn't leave until it was corrected to the utmost degree. So,… Read more


  • Hi Scott, this is a customer, Karen. I had a new tech at my house this morning, and we were very pleased with him. He was very, very nice. In the past, well we've used Princeton Air at our house here, and our house before this on Courtney Drive.…

    Read more


  • Hi Scott, it’s Steve, general manager of the Nassau Club of Princeton. I just wanted to let you know on this Friday, that you know Jack's over here doing his stuff. And I can't tell you how pleased I am by signing that maintenance contract with your… Read more


  • My Name is Irma, I just recently had insulation. I just want to let you know that the men who were here that worked on the house, the main two on the team were Jim and Nestor. I want to let you know that the entire team, there were other men, that I… Read more


  • Hello, my name is Sunit in Flemington, New Jersey. This morning, I had your service technician come out to service my two heating units, Lennox. I can tell you in 20 years I've never seen a person showing such a professional attitude and doing such… Read more


  • Hey Scott, Tom here & it's Tuesday morning. I just wanted to call to say thank you very much for having your service guy come out last night. He got there a little before 8:00, he was done about 8:45, we're back to full operating… Read more


  • Mr. Needham, my name is Harriet; I am a customer of Princeton Air since I moved into Raven's Crest about ten years ago. Luckily I haven't had to have too many service calls but I did have an emergency today and within three hours of my phone call… Read more


  • Scott, my name is Michael; I'm a resident of West Windsor. I just had your tune-up, I have service with you, had it for years. Just had an air conditioning tune-up this morning. The technician was Alberto Martino and he did an absolutely fabulous… Read more


  • Rob and I want to thank you and Dennis, Ontrea, Francine, Chris, Marty, Mike and all of your crew for being so customer service friendly in handling our installation of our new A/C and furnace system. We can see why the original owners of our home… Read more

    Linda and Rob, Princeton Junction

  • I just want you to know what an excellent job your crew did installing our new Trane heating system on Tuesday morning. They arrived promptly and explained to me exactly what they would be doing. The three men worked as a team and were very… Read more

    Elaine, Lawrence

  • The technician (Kevin) was wonderfully polite and respectful of my home. He was very professional, patient, thorough, and showed a genuine concern for the well-being of my family

    Vera, Princeton