Description

Who the Navien NHB-150H Suits

The Navien NHB-150H is a heating-only condensing boiler for homes with radiators, baseboard or radiant floor heat, or for pairing with an indirect tank for domestic hot water. Navien rates it at 10,000 to 150,000 BTU/h input with a 120,000 BTU/h net AHRI rating, the highest in the NHB-H line, so it is the size to look at when a heat-loss calculation comes back above what the NHB-110H can cover. The right size comes from that heat-loss calculation, not the old boiler’s nameplate; GSHA Services, LTD runs it as part of the free estimate for homeowners in McHenry County and Lake County, IL, and the surrounding Chicago suburbs and southeastern Wisconsin.

What You Get With the NHB-150H

• 95.0% AFUE condensing efficiency. AFUE is the heating-efficiency rating for boilers and furnaces; higher is better. The NHB-150H uses a second stainless steel heat exchanger to capture heat from the exhaust, which is why efficiency is this high and why it vents in PVC and needs a condensate drain. Both heat exchangers are stainless steel, the material that stands up to the acidic condensate a condensing boiler produces. It is ENERGY STAR certified per Navien.
• 15:1 turndown ratio. Turndown is how low the burner can modulate. The NHB-150H can run anywhere from 10,000 to 150,000 BTU/h, so on a mild fall day it idles at low fire instead of cycling on and off, which means steadier room temperatures and less wear.
• Built-in zoning. The control board runs the boiler pump plus up to three zone valves or three zone pumps, so a home split into heating zones can be controlled from the boiler itself.
• Compact, wall-hung cabinet. At 17.3 in. wide, 23.8 in. tall and 12.8 in. deep and 80 lbs, it hangs on the wall and frees the floor space a cast-iron boiler used to take.
• Flexible venting and fuel. Direct vent in 2 in. PVC up to 65 ft or 3 in. up to 150 ft; in many homes that means a sidewall vent rather than the old chimney. Runs on natural gas or propane and is field-convertible.

Navien NHB-150H Price and Installation Estimate

Installed from $8,950.00

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

This is a complete installed package, not an equipment-only price. The standard NHB-150H installation from GSHA Services, LTD includes:

• Mounting and leveling the boiler (floor stand included where the location calls for it)
• New electrical disconnect, power and control wiring
• Supply and return connections with 1-1/4 in. isolation flanges
• New 3-speed cast-iron circulator, aquastat, autofill combination valve and union
• 1-1/4 in. hydraulic separator, expansion tank and hydronic docking station
• 3 in. PVC venting with sidewall vent kit
• Commissioning kit (Protector F1 and Cleaner F3) for system water treatment
• Honeywell T4 Pro hydronic thermostat
• Removal of the old boiler
• One-year boiler tune-up
• Start-up and safety inspection

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 to the existing system, permits, optional accessories, and how accessible the boiler location is. The in-home estimate is free and confirms the exact price before any work begins. Financing is available with approved credit.

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

Navien NHB-150H Specifications

Navien does not publish a sound rating for this model. Domestic hot water flow and UEF do not apply because the NHB-150H is a heating-only boiler.

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. Installations are performed by Navien Level 3 trained technicians. The standard installation scope above covers the boiler, near-boiler piping, venting, controls and start-up; the estimate confirms anything your home needs beyond it.

Navien limited warranty (residential, single-family): 1 year on labor and 5 years on parts. The heat exchanger is fully covered for 10 years. In years 11 through 15 coverage is pro-rated, with the homeowner paying a rising share of the heat exchanger cost (30% in year 11 up to 70% in year 15). Coverage runs from the installation date, so the homeowner or installer must provide proof of the installation date to Navien. Navien Technical Support must be contacted before warranty service, and units bought through internet or e-commerce channels are not covered.

GSHA Install-Right coverage: Navien NHB-H boiler packages installed by GSHA add 10-year parts and 10-year labor coverage from GSHA. Labor coverage requires annual GSHA maintenance, and service by another company voids GSHA’s labor coverage. This is GSHA’s own coverage and is separate from Navien’s limited warranty.

Navien NHB-150H FAQs

How much does a Navien NHB-150H cost installed?

The GSHA installed package for the Navien NHB-150H starts from $8,950.00. That includes the boiler, near-boiler piping, circulator, expansion tank, hydraulic separator, PVC venting, thermostat, removal of the old boiler and start-up. Gas line, venting route, condensate drain, zoning changes and permits can change the final quote, which the free estimate confirms.

Does the NHB-150H make domestic hot water?

No. The NHB-150H is a heating-only boiler. It can heat domestic water through an indirect tank as a separate zone, or you can look at a Navien NCB-H combi-boiler, which is one wall-hung unit that does both home heating and hot water.

Is the NHB-150H the right size for my home?

Only a heat-loss calculation can answer that. The NHB-150H is the largest NHB-H size at 150,000 BTU/h input, so it suits larger homes or higher heating loads; smaller homes are usually better served by the NHB-55H, NHB-80H or NHB-110H. Because the NHB-150H modulates down to 10,000 BTU/h, it still runs efficiently on mild days, but an oversized boiler is never the goal.

What venting does the NHB-150H need?

It is a direct-vent boiler that uses 2 in. PVC up to 65 ft or 3 in. PVC up to 150 ft, plus a condensate drain. In most homes this means a sidewall vent rather than the old chimney. The standard installation includes 3 in. PVC with a sidewall vent kit.

What warranty comes with a GSHA-installed NHB-150H?

Navien’s residential warranty is 1-year labor, 5-year parts and a 10-year heat exchanger with pro-rated coverage in years 11 to 15. GSHA adds 10-year parts and 10-year labor coverage, conditioned on annual GSHA maintenance; service by others voids GSHA’s labor coverage.

Can the NHB-150H run on propane?

Yes. Navien lists the NHB-150H for natural gas or propane, and it is field-convertible. Tell us your fuel at the estimate so the boiler is set up correctly on installation day.

Navien NHB-H boiler questions homeowners ask

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

Yes. GSHA Services, LTD installs, services and repairs Navien boilers, including this Navien NHB-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 within its service area, including earlier NHB models that Navien no longer sells. A discontinued model does not automatically need to be replaced; if parts are available and the stainless steel heat exchangers are 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 NHB-H model is a heating-only condensing boiler: it heats your home through radiators, baseboard or radiant floors but does not make domestic hot water. For showers and taps it needs an indirect water heater fed by the boiler or a separate water heater (tank or tankless). A combi boiler such as the Navien NCB-H or NFC-H does both jobs in one cabinet, and a tankless water heater makes hot water only. A heating-only boiler with an indirect tank is often chosen when you want a large stored hot-water supply or already have a good water heater; the free on-site estimate helps you decide.

Is this boiler for steam or hot-water heating?

This Navien NHB-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 NHB-H model includes setting and leveling the boiler on a floor stand, a new electrical disconnect with power and control wiring, supply and return connections with isolation flanges, a new three-speed circulator, an aquastat, an automatic fill valve, a hydraulic separator, an expansion tank, a hydronic docking station, 3-inch PVC venting with a sidewall vent kit, the system commissioning kit, a hydronic thermostat, removal of the old equipment, a one-year boiler tune-up, and start-up with a safety inspection. Every installation is custom, so the venting route, gas line capacity, condensate drainage, piping and zoning changes, water treatment, electrical work, permits and accessories such as NaviLink, an indirect water heater or 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 exchangers are sound, the fault is a single part such as a sensor, igniter, circulator 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 Estimate for the Navien NHB-150H

GSHA Services, LTD installs and services Navien boilers from our Woodstock and Lake Bluff, IL locations. Request an Installation Estimate online or call (224) 220-3660. See all sizes and prices on our Navien boilers page, learn about our boiler installation service, or check our service area. Related models: Navien NHB-55H, Navien NHB-80H, Navien NHB-110H and Navien NFB-175H.