Expert repair, tune-ups, and installation for Navien boilers across Suffolk and Nassau County, backed by 24/7 emergency service.
Domino Fuel repairs, tunes, and installs Navien boilers across Long Island. Our licensed, factory-trained technicians service every Navien model, with free installation estimates and 24/7 emergency no-heat service.
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Navien is one of the boiler brands we proudly service and install across Long Island. As part of our full boiler service, our factory-trained technicians know Navien systems inside and out, from routine tune-ups to full replacements.
Browse all the boiler brands we carry, or see the rest of our heating services.
Navien is a leader in high-efficiency condensing boilers and combi-boilers. Their condensing models use a stainless steel heat exchanger to capture heat from exhaust vapor, reaching an industry-leading 95% AFUE and reducing energy use by up to 20%. The NCB-H and NFC-H combi-boilers deliver whole-house heating and domestic hot water from one compact, wall-hung unit, while the NHB-H heating boilers (NHB-55, 80, 110, and 150) cover homes of every size.
Navien boilers are prized for their high turndown ratios (up to 15:1), flexible PVC and stainless venting that simplifies installation, and strong domestic hot water performance. We install, service, and repair the full Navien lineup across Long Island.
Navien boiler highlights:
Here is roughly what a new boiler costs to install, using current national averages. Because Navien builds high-efficiency condensing boilers, a Navien project usually lands in the higher 90%+ AFUE range below, where the extra upfront cost is offset by roughly 10-20% lower energy bills.
| Boiler type | Typical installed cost (U.S. average) |
|---|---|
| Standard-efficiency (80-89% AFUE) | $2,200 - $7,000 |
| High-efficiency condensing (90%+ AFUE) | $6,000 - $11,000 |
| Gas boiler (typical) | $4,000 - $9,000 |
National averages from HomeAdvisor and Angi (2026): boiler installation averages about $5,912, and most projects fall between $3,604 and $8,445. Your Long Island price depends on boiler type and size, fuel, venting, and how much existing piping can be reused.
Want your exact number? Costs vary from home to home, so we never guess. Get a free estimate for your exact Navien boiler installation price, with no obligation.
Here is a quick look at the main Navien boiler models we install and service on Long Island, so you can compare type, fuel, and efficiency at a glance.
| Model / Series | Type | Fuel | Efficiency | Best For |
|---|---|---|---|---|
| NHB-H (55 / 80 / 110 / 150) | Condensing, heat-only | Natural gas / propane | 95% AFUE | Whole-home hydronic heat, every size |
| NCB-H | Condensing combi | Natural gas / propane | Up to 95% AFUE | Heat + on-demand hot water, tight spaces |
| NFC-H | Condensing combi | Natural gas / propane | Up to 95% AFUE | Homes needing higher hot-water flow |
All Navien condensing boilers offer up to a 15:1 turndown ratio and use flexible PVC/CPVC or stainless venting. Efficiency figures are manufacturer AFUE ratings.
Every Navien boiler installation starts with a free in-home assessment and a proper heat-loss calculation, so your new boiler is sized correctly for your home instead of just swapped like-for-like. Our licensed, factory-trained technicians install natural gas and propane Navien models, set up sealed-combustion PVC, CPVC or stainless venting that can often run straight out a sidewall, pull permits, and fully commission the system before we leave.
Because Navien NHB and NCB units are high-efficiency condensing boilers, we make sure condensate drainage and venting are done right for years of quiet, trouble-free heat. When the work is done you get clean, safe, efficient heat backed by our workmanship warranty. See our full boiler service or browse all boiler brands.
If your Navien boiler is making noise, leaking, throwing an error code, or simply not heating, our technicians diagnose and repair it quickly, with 24/7 emergency no-heat service across Suffolk and Nassau County. We carry or quickly source common Navien parts, so most repairs are finished in a single visit.
We also perform annual tune-ups that keep your boiler safe and efficient, catch small problems before they become breakdowns, and help keep your Navien warranty valid. On Navien's digital models we read the on-board diagnostics and run combustion testing to confirm the fix.
When a boiler is beyond economical repair, we make replacement simple. We will tell you honestly whether your Navien boiler is worth fixing or whether a newer, more efficient unit will pay for itself in lower bills. Many Long Island homeowners use a replacement to step up to a high-efficiency condensing Navien model, convert from oil to gas, or right-size a system that never quite kept up.
We handle removal and disposal of the old boiler, any venting or piping changes, and available rebates and financing, all with a free estimate up front. Compare options on our boiler brands page or explore the full heating services we offer.
Catching these early usually means a smaller, cheaper fix. Call us if your Navien boiler shows any of the following:
Repair is not always the smart money. It is usually time to replace your Navien boiler when you see:
We stock or quickly source the parts that wear out most on Navien boilers, so repairs and tune-ups stay fast:
Not sure what your Navien boiler needs? Contact us or call (631) 779-3196 and we will diagnose it for you.
Not sure which brand fits your home? Explore the other boiler brands we install and service across Long Island.
Common questions about this boiler brand on Long Island.
Yes. Our licensed, factory-trained technicians repair all Navien boiler models across Suffolk and Nassau County, including 24/7 emergency no-heat service.
Yes. We install and replace Navien boilers, sized correctly for your home with a proper heat-loss calculation and installed to code, with a free estimate up front.
Navien is a respected boiler brand we are glad to install and service. The best model for you depends on your home, fuel, and budget, and we will give you honest, no-pressure guidance and a free estimate.
Once a year, before the heating season. An annual tune-up keeps your boiler safe and efficient, prevents breakdowns, and helps keep the manufacturer warranty valid.
Yes. Navien boilers include high-efficiency condensing options, with many models reaching the 90 percent AFUE range, which lowers fuel use compared with older boilers. We will help you choose the right model for your home.
With regular maintenance, a quality boiler typically lasts about 15 to 20 years. Annual service is the biggest factor in reaching the upper end of that range.
Get a free, no-obligation quote from your local Long Island boiler experts.
