Description

Who the Navien NFC-250/175H suits

The NFC-250/175H is Navien’s larger fire tube combi-boiler, built for bigger homes where the smaller NCB-H models run out of heating capacity. A combi-boiler is one wall-hung unit that handles both home heating (radiators, baseboard, radiant floor or a hydro air handler) and domestic hot water, so it replaces a separate boiler and water heater.

Navien rates this model at up to 175,000 BTU/h heating input (161,000 BTU/h heating capacity) and up to 210,000 BTU/h for domestic hot water, delivering 8.4 GPM at a 45°F rise. GPM at a temperature rise tells you how many fixtures can run at once when incoming water is cold in a Midwest winter, which is why we size to your home’s heat loss and hot-water habits rather than to the badge on the box.

If your heating load is larger still, see the NFC-250/200H; if it is smaller, the NCB-250/150H may be the better fit. Navien lists the NFC-250/175H for residential or commercial use; this page is written for homeowners in McHenry County and Lake County, IL, and the surrounding Chicago suburbs and southeastern Wisconsin.

Benefits you will notice

• Heat and hot water from one cabinet. One 17.3″ x 33.5″ x 17.3″ wall-hung unit replaces a floor boiler and a tank water heater, which frees up floor space in the mechanical room.
• 95% AFUE, ENERGY STAR certified. AFUE is the heating efficiency rating. As a condensing appliance, the NFC-250/175H recovers heat from its exhaust that older boilers send up the chimney, which is why it vents in PVC and needs a condensate drain.
• Wide modulation for steadier comfort. Turndown ratio is how low the burner can modulate. Navien lists a 13:1 heating turndown and 15:1 for hot water (heating input from 13,300 BTU/h), so the boiler runs long and low in mild weather instead of short cycling, and hot-water temperature stays steady at small draws.
• Durable stainless heat exchangers. The patented stainless steel fire tube heat exchanger is built to the ASME boiler code, and hot water is made in a separate stainless flat plate exchanger. Navien backs the heat exchanger for 10 years in residential use.
• Built-in zoning and hot-water controls. The unit includes powered connections for 3 zone valves or 3 zone pumps, an integrated boiler pump, and a DHW module with mixing and water adjustment valves, so many homes need fewer add-on controls.

Price and installation estimate

Installed from $10,948.71. This is a complete installed package for the Navien NFC-250/175H, not an equipment-only price. The standard combi-boiler installation includes:

• Setting and leveling the unit
• Water piping modifications
• Gas line modification and a new gas valve
• New condensate drain line
• New 150 lb pressure relief valve
• 4.8-gallon hydronic expansion tank and a domestic hot water thermal expansion tank
• Navien primary manifold kit and NaviClean magnetic filter
• Commissioning kit (Protector F1 and Cleaner F3)
• New PVC flue venting
• Removal and disposal of the old equipment
• Start-up, testing and a safety inspection

Every boiler installation is custom. The “Installed from” price is the starting installed package for this model with GSHA’s standard installation scope; your final price is confirmed by a free on-site estimate. What changes it: the venting route and length, gas line capacity, condensate drain routing, piping and zoning changes (circulators, zone valves, expansion tank and air separation), water-quality treatment, electrical work, removal of the old boiler, permits, and accessories such as NaviLink controls or manifolds, which are priced separately. Financing available with approved credit.

Schedule Boiler Repair | Request a Boiler Installation Estimate or call (224) 220-3660

What can change the final quote: gas line capacity and length, the venting route and length, where the condensate can drain, water quality treatment, electrical work, zoning and piping changes, permits, accessories such as NaviLink Wi-Fi or a NaviCirc recirculation valve, and access to the installation area. The estimate is free and confirms the exact scope before any work starts. Financing available with approved credit; see financing options.

Request an Installation Estimate or call (224) 220-3660.

Navien NFC-250/175H specifications

Sound level and AHRI-listed capacity: see Navien product data. Boilers are rated by AFUE, so UEF does not apply.

Installation and warranty

GSHA Services, LTD is a Navien Service Specialist (NSS), an authorized Navien dealer, and is listed on Navien’s installer locator at navieninc.com. Our Navien Level 3 trained technicians install the NFC-250/175H with the complete scope listed above, including new PVC venting, a condensate drain, the primary manifold kit, magnetic filter and system commissioning chemicals, then start it up and inspect it before we leave.

Optional add-ons at price-book accessory prices: NaviLink Wi-Fi control ($288.43), NaviLink Lite ($153.55) and the NaviCirc recirculation valve ($99.60); any added installation labor is confirmed in the estimate. NaviCirc recirculates hot water through your existing hot and cold lines when there is no dedicated return line, which shortens the wait at far fixtures.

Navien limited warranty (residential): 1 year labor, 5 years parts and 10 years on the heat exchanger. Residential terms apply to single-family residential use; the unit must be installed by a properly licensed contractor per Navien’s manual, and units bought online or through e-commerce channels are not covered. Proof of the installation date must be provided to Navien by the homeowner or installer; otherwise the warranty period starts six months after the date of manufacture.

GSHA Install-Right coverage: our combi-boiler installation package adds 5-year labor and 5-year parts coverage from GSHA. Labor coverage requires annual GSHA maintenance; service by others voids GSHA’s labor coverage. Navien’s warranty and GSHA’s coverage are separate, and warranty service starts with a call to us as the original installer.

Frequently asked questions

How much does a Navien NFC-250/175H cost installed?

The installed package starts from $10,948.71 for the standard combi-boiler installation described above. Gas line, venting, condensate, electrical, zoning and accessory needs can change the final quote, which we confirm with a free estimate.

Is the NFC-250/175H big enough to heat my home and supply hot water?

It is Navien’s larger combi-boiler, with 175,000 BTU/h heating input and 8.4 GPM of hot water at a 45°F rise, built for homes where an NCB-H model is not big enough. We calculate your home’s heat loss and review your hot-water use before recommending it, and we can step up to the NFC-250/200H or down to an NCB-H model if the numbers say so.

Does it need a chimney?

No. It is a condensing boiler that vents through 2″ or 3″ PVC or CPVC pipe, up to 65 ft with 2″ pipe or 150 ft with 3″ pipe, and it needs a condensate drain because the exhaust cools enough to produce water.

Can it run on propane?

Yes. Navien lists the NFC-250/175H for natural gas or propane, with field gas conversion kits. Tell us which fuel you have when you request the estimate.

Can I control it from my phone?

Yes, with the optional NaviLink or NaviLink Lite Wi-Fi accessory; Wi-Fi is not built into the boiler. Both are compatible with the NFC-H series and are available as add-ons with your installation.

What warranty comes with it?

Navien’s residential limited warranty covers 1 year labor, 5 years parts and 10 years on the heat exchanger. GSHA adds 5-year labor and 5-year parts coverage on the installation package, provided the boiler receives annual GSHA maintenance; service by others voids GSHA’s labor coverage.

Navien NFC-H boiler questions homeowners ask

Do you install and repair Navien NFC-H boilers in my city?

Yes. GSHA Services, LTD installs, services and repairs Navien boilers, including this Navien NFC-H model, across McHenry County and Lake County, Illinois, the northern and western Chicago suburbs and southeastern Wisconsin, from our Woodstock and Lake Bluff locations. GSHA is a Navien Service Specialist (NSS), approved June 30, 2026, is listed on Navien’s installer locator at navieninc.com, and sends Navien Level 3 trained technicians. Check the service-area page or call (224) 220-3660 to confirm your address.

Can my existing or discontinued Navien boiler be repaired?

Yes. GSHA Services, LTD repairs existing Navien boilers and combi-boilers within its service area, including earlier NFC and NCB models that Navien no longer sells. A discontinued model does not automatically need to be replaced; if parts are available and the fire tube heat exchanger is sound, repair is usually the sensible first step. As a Navien Service Specialist (NSS), GSHA diagnoses the fault, checks parts availability and gives you a repair-or-replace recommendation before any work starts.

What is the difference between a combi boiler and a heating-only boiler?

This Navien NFC-H model is a fire tube combi boiler: one appliance that heats your home through radiators, baseboard or radiant floors and also makes domestic hot water for showers and taps on demand. A heating-only boiler such as the Navien NFB-H (also fire tube) heats the home only; for hot water it needs an indirect water heater or a separate water heater. A tankless water heater makes domestic hot water only and does not heat the house. The NFC-H is the larger combi in Navien’s line, so it suits bigger homes with higher heating and hot-water demand; the free on-site estimate confirms the fit.

Is this boiler for steam or hot-water heating?

This Navien NFC-H model is a hot-water (hydronic) boiler only; it is not a steam boiler and is not rated for steam in any size. It suits homes with hot-water baseboard, radiators or radiant floor loops. If your home has a steam system (one-pipe radiators with air vents, a sight glass on the boiler), it needs a steam boiler, not this model. The free on-site estimate confirms which system your home has.

What does installation include and what can change the price?

GSHA’s standard installed package for this Navien NFC-H model includes setting and leveling the boiler, water piping modifications, gas line modification with a new gas valve, a new condensate drain line, a new relief valve, a hydronic expansion tank and a domestic hot-water thermal expansion tank, the Navien primary manifold kit, a NaviClean magnetic filter, the system commissioning kit (cleaner and protector), new PVC flue venting, removal and disposal of the old equipment, and start-up, testing and a safety inspection. Every installation is custom, so the venting route, gas line capacity (this is a high-input boiler), condensate drainage, piping and zoning changes, water treatment, electrical work, permits and accessories such as NaviLink or extra manifolds can change the final price. The free on-site estimate confirms it.

When does repair make more sense than replacement?

Repair usually makes sense when the boiler is younger, the heat exchanger is sound, the fault is a single part such as a sensor, igniter, pump or gas valve, and parts are available. Replacement becomes the better choice when a heat exchanger is leaking or cracked, repairs are repeating every season, parts for an older model are hard to get, the unit is the wrong size for the home, or there is a venting or gas safety concern. An older non-condensing boiler running well below 90% AFUE is another reason to compare the two. GSHA gives you both options with honest reasoning during a service visit or a free on-site estimate.

Get a free installation estimate

Ready to replace a boiler and water heater with one high-efficiency Navien combi-boiler? Request an Installation Estimate online or call (224) 220-3660. GSHA Services, LTD serves homeowners from Woodstock and Lake Bluff, IL; see our service area, compare all Navien boilers and combi-boilers, learn about boiler installation, or browse Navien tankless water heaters.