--- title: "Authorized Navien NSS Dealer & Installer on Long Island - Big City Plumbing and Heating" description: "Big City Plumbing: We are a factory-certified Navien Service Specialist (NSS) providing expert installation, repair, and maintenance for Navien tankless systems on Long Island." lang: en json-ld: | { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "What does being a Navien Service Specialist (NSS) mean?", "acceptedAnswer": { "@type": "Answer", "text": "An NSS is a plumbing professional who has completed specialized factory training and has been vetted by Navien to perform high-level repairs and warranty work." } }, { "@type": "Question", "name": "Will my Navien warranty be void if a non-authorized plumber installs it?", "acceptedAnswer": { "@type": "Answer", "text": "While laws vary, Navien’s warranty policy strictly requires installation by a licensed professional, and using an NSS dealer ensures all documentation is filed correctly to prevent warranty denials." } }, { "@type": "Question", "name": "How often does a Navien tankless water heater need service on Long Island?", "acceptedAnswer": { "@type": "Answer", "text": "Due to the local water conditions, we recommend a professional descaling flush and filter cleaning every 12 to 18 months to prevent scale buildup." } }, { "@type": "Question", "name": "Can an NSS dealer help with Navien rebate programs?", "acceptedAnswer": { "@type": "Answer", "text": "Yes, as authorized dealers, we can provide the necessary documentation and guidance for PSEG Long Island or National Grid energy-efficiency rebates." } }, { "@type": "Question", "name": "What is the difference between a Navien tankless and a combi-boiler?", "acceptedAnswer": { "@type": "Answer", "text": "A tankless unit provides only domestic hot water, while a Navien Combi-boiler (NCB) provides both hot water for your faucets and hydronic heating for your home's radiators or baseboards." } } ] } --- We use cookies to analyze site traffic and improve your experience. [Privacy Policy](/privacy-policy) DeclineAccept [![Big City Plumbing & Heating](/__l5e/assets-v1/c81cc3eb-3640-451e-a656-a0664993de13/big-city-plumbing-and-heating-logo-2.png) Big City Plumbing and Heating ](/) [Home](/)[About](/about-us)Services[Projects](/projects-gallery)[Reviews](/reviews)[How-To Videos](/how-to-videos)Links[Contact](/contact-us) [CALL US!631-361-9500 ](tel:631-361-9500) [CALL US!](tel:631-361-9500) [Back to Blog](/blog) # Authorized Navien NSS Dealer & Installer on Long Island February 11, 2026 ![Authorized Navien NSS Dealer & Installer on Long Island](https://wjaulyvqzywcnkegnzoh.supabase.co/storage/v1/object/public/blog-images/authorized-navien-nss-dealer-installer-on-long-island-1770756885253.png) ## Authorized Navien NSS Dealer & Installer on Long Island ### Direct Answer As a factory-certified Navien Service Specialist (NSS), our company is authorized by Navien to provide professional installation, warranty repairs, and specialized maintenance for all Navien tankless water heaters and combi-boilers. This designation ensures that your high-efficiency unit is installed to manufacturer specifications, preserving your warranty coverage and ensuring the system operates at peak energy efficiency for its entire lifespan. ### Why Choose an Authorized Navien Service Specialist? Choosing an authorized NSS dealer over a general contractor ensures your home comfort system is handled by technicians with factory-level training. Navien systems are sophisticated pieces of engineering that require specific technical knowledge. **The Benefits of Authorized Installation:** - **Warranty Protection:** Navien often requires proof of professional installation by a licensed tech to honor parts and heat exchanger warranties. - **Precision Calibration:** Authorized installers use specialized tools to verify gas pressure and combustion levels, preventing "short-cycling." - **Priority Support:** NSS dealers have a direct line to Navien’s technical engineering team for complex troubleshooting. - **Genuine Parts:** We only use OEM (Original Equipment Manufacturer) components, which fit perfectly and last longer than generic alternatives. **Common Tankless Issues We Solve:** - **Error Codes:** Decoding and fixing frequent alerts like E001 (overheating) or E110 (exhaust blockage). - **Scale Buildup:** Performing professional descaling flushes to remove mineral deposits from the heat exchanger. - **System Sizing:** Calculating the exact GPM (Gallons Per Minute) needed to ensure your Long Island home never runs out of hot water. ### Local Context: Navien Systems on Long Island In Nassau and Suffolk Counties, Navien systems are particularly popular due to our high property taxes and the push for energy efficiency. However, Long Island presents unique challenges for tankless units: - **Water Hardness:** Many areas in Suffolk County have high mineral content. Without an authorized installer setting up a proper filtration or scheduled descaling plan, the heat exchanger can fail prematurely. - **Oceanic Air:** For homes in coastal areas like Long Beach or Montauk, salt air can lead to faster corrosion if the venting isn't sealed perfectly according to Navien’s strict NSS guidelines. - **Historical Housing:** Many Long Island homes are older conversions. We specialize in retrofitting these homes, ensuring the existing gas lines can handle the high-BTU demand of a tankless system. ### Homeowner Guidance: Maintenance vs. Professional Service **What You Can Safely Check:** - **Air Intake:** Ensure the PVC vent pipes on the exterior of your home are clear of snow, bird nests, or debris. - **The Display:** Check the digital screen for any error codes. Write these down before calling a technician. - **Listen for Noises:** If you hear unusual whistling or vibrating, it’s time for a checkup. **When to Call an Authorized Plumber:** - If you see any water leaking from the bottom of the unit. - If the unit displays a persistent error code that won't clear after a reset. - If you have reached the 12-month mark since your last professional descaling flush. - If you smell gas or notice scorching on the unit’s exterior cabinet. ### From a Long Island Plumber’s Perspective "On Long Island, we see a lot of 'DIY' tankless installs that fail because the gas line wasn't upsized correctly or the venting was sloped the wrong way. As an NSS dealer, my goal isn't just to hang a box on the wall; it's to make sure that unit survives the North Shore winters and the South Shore humidity. A Navien is an investment, and having it serviced by someone who actually knows the internal circuit board and sensors makes all the difference in how many years of hot water you'll actually get out of it." ### Work With a Local Navien Specialist Maintaining your home’s hot water supply shouldn't be a source of stress. By choosing an authorized Navien Service Specialist, you ensure your system is safe, efficient, and fully covered by the manufacturer. If you need a new installation or a repair on an existing unit, reaching out to a local professional who understands the specific plumbing requirements of Long Island is the best way to protect your home's infrastructure. ## Frequently Asked Questions ### What does being a Navien Service Specialist (NSS) mean? ### Will my Navien warranty be void if a non-authorized plumber installs it? ### How often does a Navien tankless water heater need service on Long Island? ### Can an NSS dealer help with Navien rebate programs? ### What is the difference between a Navien tankless and a combi-boiler? ![Big City Plumbing & Heating](/__l5e/assets-v1/c81cc3eb-3640-451e-a656-a0664993de13/big-city-plumbing-and-heating-logo-2.png) Big City Plumbing and Heating Licensed & insured plumbing and heating professionals serving New York since 1988. #### Quick Links - [Home](/) - [Services](/plumbing-services) - [About](/about-us) - [Reviews](/reviews) - [Blog](/blog) - [Contact](/contact-us) - [Financing](/financing) #### Services - [Plumbing Repair](/services#plumbing-repair) - [Heating Systems](/services#heating-systems) - [Tankless Water Heaters](/services#tankless-water-heaters) - [Gas Conversion](/services#gas-conversion) - [Emergency Services](/services#emergency-services) #### Contact - 631-361-9500 - 718-326-5833 (NYC) - Nassau, Suffolk & NYC [](http://www.facebook.com/bigcityplumbing?ref=tn_tnmn%20/bigcityplumbing.heating)[](https://www.instagram.com/bigcityplumbingandheating/)[](https://x.com/bigcityplumbing)[](https://www.linkedin.com/profile/view?id=AAkAAAUWvLUB1msy7omBhpMetwl7zMHANsC8wzs)[](http://www.yelp.com/biz/big-city-plumbing-and-heating-centereach)[](https://www.youtube.com/channel/UC8fcDyolqilmFXHt8pg377Q) © 2026 Big City Plumbing and Heating. 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