Navien NHB-150 150,000 BTU LP/NG Condensing Gas Boiler


Weight: 120.00 lbs
MPN: NHB-150

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Get an efficient, high performance condensing gas boiler for limitless hot water.

The new NHB boiler series features the next line of innovations by Navien. All NHB boilers come with Navien's advanced burner system, the industry-leading AFUE of 95% and a turn down ratio of up to 15:1.

Navien NHB Navien NHB


Ultra Condensing Efficiency
• Navien's condensing technology provides high efficiency heating
• Saves more money and energy than traditional water heaters and other boilers.

Two Stainless Steel Heat Exchangers
• Reduces minerals deposits.
• High resistance to corrosion and erosion means longer life expectancy.

Low NOx Emissions (less than or equal to 20ppm)
• Newly designed metal fiber burner delivers a consistent gas/air mixture, improving combustion efficiency.
• Less production of greenhouse gases and acid rain.
• Complies with strict SCAQMD 1146.2 NOx emissions standards.

2" CPVC, PVC, Polyprophylene Venting Up To 60 feet
• 2" venting option allows a flue to be pulled through existing vents.
• 3" vents can be used for up to 150 feet with 2" x 3" adapters.

Field Convertible
• NHB heaters allow for easy convertibility from natural gas to liquid propane.

Powerful Anti-Freeze System
• The built-in Control System was designed to keep the unit frost free in winter conditions.

Hydronic Heating Benefits
• Economical, clean, silent, and comfortable

TDR up to 15:1
• The NHB-150 has a turn down ratio of up to 15:1 which helps prevent short cycling

Utilizes Existing 1/2" Gas Line
• Negative Pressure Gas Valve with dual venturi operation allows better adaptability in low gas pressure applications.
• NHB boilers can be installed on 1/2" gas lines for up to 24'

Navien contractor installingCascade multiple units in parallel for larger applications. Everything is included in the box.
NHB-150 boilers that ship from GadgetsGo are the latest version, which have Navien's Ready-Link cascading system.
• Built-in controls for easily configuring the settings for a multi-unit, cascading system.
• No extra control boards are required, so your installation cost are lower.
• Easily wire together units and set one boiler as parent and one as child.
• Up to 16 units can be linked in one group. Unlimited groups can be cascaded. Cascading creates redundancy to ensure hot water availability.
• NHB-series boilers can be installed on a wall, and have a compact, small form factor. This allows for a multi-unit installation in a smaller area.
• Popular applications: Hotels, restaurants, schools, hospitals, health centers, beauty shops, and more.

Navien-CH-ASME Navien-CH-ASME asme-logo NSF logo ahri-seal CSA-certified


Max BTU per hour input 150,000
Dimensions 24in. (H) x 17in. (W) x 13in. (D)
Weight 80 lb (36 kg)
Installation Type Indoor Wall-Hung
Venting Type Forced Draft Direct Vent
Ignition Electronic Ignition
Natural Gas Supply Pressure (from source) 3.5 in.–10.5 in. WC
Propane Gas Supply Pressure (from source) 8.0 in.–13.5 in. WC
Natural Gas Manifold Pressure -0.40 in. WC
Propane Gas Manifold Pressure -0.30 in. WC
Gas Connection Size 3/4 in. NPT (female)
Space Heating Water Supply and Return Connection Sizes 1 in. NPT
Main Power Supply 120V AC, 60Hz
Maximum Power Consumption Less than 10A
Casing Cold-rolled carbon steel
Heat Exchangers Primary and Secondary: Stainless Steel
Exhaust 2 in. or 3 in. PVC, CPVC, approved polypropylene* 2 in. or 3 in. Special Gas Vent Type BH (Class III, A/B/C)
Intake 2 in. or 3 in. PVC, CPVC, polypropylene 2 in. or 3 in. Special Gas Vent Type BH (Class III, A/B/C)
Vent Clearance 0 in. to combustibles
Safety Devices Flame Rod, APS, Gas Valve Operation Detector, Ignition Operation Detector Water Temperature High Limit Switch, Exhaust Temperature High Limit Sensor
Maximum Altitude Operation 10,100 feet with appropriate dip switch settings

Box contents

Installation & Operation Manual
User's Information Manual
Quick Installation Manual
Wall Mounting Bracket
Four Tapping Screws & Anchors
LP or NG Conversion Kit
Two 2" Vent Termination Caps
Four 2" Wall Flanges
Air Vent
Pressure Relief Valve for Heating
Outdoor Temperature Sensor and Cable
Air Vent Bushing (3/4" to 1/2")
Spare Parts (fuse, etc.)


Quick Installation Guide
Energy Guide Label
User's Information Manual
Operation & Installation
Gas Conversion Guide

Frequently Asked Question ("FAQ")

Q: Which thermostat(s) will work with this unit?
A: Any thermostat that does not have a common wire will work with Navien NHB units.

Installation Help and Recommendations

We recommend that you have a professional tankless water heater installer review the above recommendations. Need an installer? Get 4 FREE Tankless Water Heater Installation Estimates Now. It's Quick and Easy!
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Consumer purchases through the internet or other e-commerce channels shall void Navien's warranty. As with all products we sell, all Navien products we sell are brand new, recently manufactured ("factory fresh"). We guarantee delivery in perfect condition to our customers.

Alternate model number spelling: NHB150

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Average Customer Rating:

5 most useful customer reviews
Donald Dobson
Dec 6, 2017
This customer purchased this item.
boiler works great... it is heating a 50x96 shop with no problem
great boiler I would recommend to anyone heating with in floor system

Advantages: runs very efficiently

Disadvantages: none that I have discovered yet
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Mar 20, 2016
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Feb 23, 2016
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Jan 31, 2016
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Gene Baker
Nov 3, 2017
This customer purchased this item.
Extremely fast service and delivery. Very pleased with the service. Would recommend this company to others.

Advantages: Very cost competitive.

Disadvantages: None, that I am aware of
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