Navien Water Heater Installation & Service in CT
(203) 876-7875
Level 3 Navien Service Specialists serving New Haven and Fairfield Counties
Onze Southern CT Plumbing & Heating is Navien’s highest-certified installer in Connecticut. After testing five major brands, we chose Navien as our product of choice for tankless water heaters and combi-boilers — and we have never looked back. Read more about why we chose Navien on our blog.
Our licensed plumbers have more than 38 years of water heater and heating system experience in Connecticut. Whether you need a new Navien system installed, a combi-boiler for combined space heating and domestic hot water, or service and annual maintenance on an existing Navien unit, Onze has the training, parts, and expertise to do the job right.
Why Onze Recommends Navien
Navien is the number one manufacturer of condensing tankless water heaters in North America. All Navien products are ENERGY STAR qualified, operate at up to 97% efficiency, and are backed by strong warranty coverage. We are proud to hold the Navien Service Specialist (NSS) Level 3 designation, the highest certification Navien offers.
- Proven product of choice: After evaluating five major brands, Onze selected Navien for its product quality, installation flexibility, warranty coverage, serviceability, and manufacturer support for certified contractors.
- Level 3 NSS certified: We hold the highest level of Navien certification available. Our technicians complete factory training at Navien’s training facility in New Jersey and recertify every three years to maintain this status.
- Parts stocked, not ordered: We keep multiple full Navien parts kits on hand for both current and discontinued models. Most repairs can be completed in a single visit.
- Up to 97% efficiency: All Navien tankless water heaters and combi-boilers are ENERGY STAR qualified with low NOx burners, reducing both energy consumption and harmful emissions.
- Industry-leading warranty: Navien NPE-2 tankless water heaters carry a 15-year limited warranty on heat exchangers and 5 years on parts — significantly longer coverage than standard tank-style units.
- Smart home ready: NaviLink Wi-Fi technology allows homeowners to monitor and adjust their Navien system from anywhere using a smartphone or tablet.
- Scalable for any home size: Navien’s Ready-Link cascading technology allows multiple units to operate as a unified system, making Navien an ideal solution for large homes and high-demand commercial applications.
Navien Products We Install
Onze installs and services the full Navien residential product lineup. For a full overview of our tankless installation process and what to expect, visit our Tankless Water Heater Installation page.
Navien NPE-S2 Condensing Tankless Water Heater
The NPE-S2 is Navien’s Standard condensing tankless water heater and the most popular choice for Connecticut homes with natural gas service. It delivers on-demand hot water at up to 0.96 UEF — more output per BTU than larger-capacity non-condensing competitors. The backlit EZNav control panel makes setup, temperature adjustment, and troubleshooting simple. Supports 1/2″ gas pipe up to 24 feet, eliminating the need to run new gas lines in most retrofit applications. 2″ PVC venting up to 75 feet. Cascade-capable up to 32 units for larger homes and commercial applications.
Available in four input sizes: 120,000 / 150,000 / 180,000 / 199,900 BTU/H. 15-year limited heat exchanger warranty, 5-year parts warranty.
Navien NPE-A2 Advanced Condensing Tankless Water Heater
The NPE-A2 is Navien’s Advanced condensing tankless model. It includes all the features of the NPE-S2 and adds Navien’s patented ComfortFlow system: a built-in buffer tank and recirculation pump that eliminates the cold-water sandwich effect and delivers hot water to fixtures faster without an external recirculation loop. Dual stainless steel heat exchangers provide added durability. Available in three input sizes: 150,000 / 180,000 / 199,900 BTU/H.
A strong choice for homeowners who prioritize instant hot water delivery throughout the home. 15-year limited heat exchanger warranty, 5-year parts warranty.
Navien NCB-H Condensing Combi-Boiler
The NCB-H is Navien’s condensing combi-boiler, combining space heating and on-demand domestic hot water in one compact, wall-hung unit. Navien is the number one manufacturer of combi-boilers in North America. The NCB-H can deliver up to 5.4 GPM of domestic hot water at a 70-degree rise — enough to run multiple showers and a dishwasher simultaneously — while also heating your home. Built-in zone controls support up to three zone valves or zone pumps.
An excellent choice for homes converting from oil to gas, or for replacing an aging boiler and tank water heater combination. One unit replaces two, saving space and simplifying the mechanical room. 10-year limited heat exchanger warranty, 5-year parts warranty, 1-year labor warranty.
Navien NHB-H Condensing Heating Boiler
The NHB-H is Navien’s dedicated condensing heating boiler for space heating applications. Available in four sizes: NHB-55H, NHB-80H, NHB-110H, and NHB-150H. All models operate at 95% AFUE with turndown ratios up to 15:1, minimizing short cycling and maintaining high efficiency across the full range of seasonal heating demands — well-suited to Connecticut’s cold winters and mild shoulder seasons.
Navien Service and Maintenance in CT
Every Navien system requires annual maintenance to protect your investment and ensure reliable performance. All gas equipment requires annual service regardless of brand, and Navien has designed a complete, straightforward service checklist that our technicians follow on every visit. Onze will send you a reminder when your system is due.
We also service and repair existing Navien systems throughout New Haven and Fairfield Counties, including units installed by other contractors. If your Navien unit is displaying error codes, producing inconsistent output, or not performing as expected, call us for a diagnostic.
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Navien Water Heater FAQ
What area do you service for Navien installation and repair?
We install and service Navien products throughout New Haven and Fairfield Counties in Connecticut.
What does Level 3 Navien Service Specialist mean?
Level 3 is the highest NSS designation Navien offers. It means our technicians have completed factory training at Navien’s facility in New Jersey, our company maintains Navien parts kits for current and discontinued models, and we have direct access to Navien’s private NSS technical support line. Learn more: What is a Navien Service Specialist?
Which Navien products does Onze install?
We install and service the NPE-S2 and NPE-A2 condensing tankless water heaters, the NCB-H condensing combi-boiler, and the NHB-H condensing heating boiler. For more on our tankless installation services, visit our Tankless Water Heater Installation page.
Do you keep Navien parts in stock?
Yes. We maintain multiple full Navien parts kits covering current and discontinued models. This allows us to complete most service calls and repairs in a single visit.
How often does a Navien system need maintenance?
Navien recommends annual maintenance on all gas-fired units. We will contact you when your system is due for its service visit. Routine annual maintenance extends the life of the unit and helps prevent unplanned failures.
What is the warranty on a Navien tankless water heater?
NPE-2 series tankless water heaters carry a 15-year limited warranty on heat exchangers and 5 years on parts. The NCB-H combi-boiler carries a 10-year heat exchanger warranty, 5-year parts, and 1-year labor warranty. Full warranty terms are available at navieninc.com.
Why did Onze choose Navien over other brands?
After testing five major brands, we selected Navien based on product quality, installation flexibility, warranty strength, serviceability, and the support Navien provides to its certified contractor network. Read the full story on our blog: Benefits of Choosing a Navien Tankless Water Heater or Navien Combi-Boiler.
Do you offer emergency service on Navien systems?
Yes. Emergency service is available throughout New Haven and Fairfield Counties. Priority emergency service is available to Onze Plumbing Protection Plan (PSA) members. Call (203) 876-7875.
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