Lochinvar (NG) NKB150N Noble Fire Tube Boiler | 150,000 BTU High Efficiency
Lochinvar (NG) NKB150N Noble Fire Tube Boiler | 150,000 BTU High Efficiency
Lochinvar (NG) NKB150N Noble Fire Tube Boiler | 150,000 BTU High Efficiency
Lochinvar (NG) NKB150N Noble Fire Tube Boiler | 150,000 BTU High Efficiency
Lochinvar (NG) NKB150N Noble Fire Tube Boiler | 150,000 BTU High Efficiency

    Lochinvar (NG) NKB150N Noble Fire Tube Boiler | 150,000 BTU High Efficiency

    In stock, ready to ship

    $3,000.00
    $3,000.00

    Lochinvar Noble NKB150N High-Efficiency Fire Tube Boiler

    The Lochinvar Noble NKB150N is a high-efficiency, wall-mounted condensing boiler designed to provide dependable heat for residential hydronic systems. With a maximum input of 150,000 BTU and 95% AFUE efficiency, it delivers strong heating performance while helping reduce natural gas consumption.

    Its stainless steel fire-tube heat exchanger provides efficient heat transfer, low pressure drop and long-term corrosion resistance. The compact wall-mounted configuration also helps preserve valuable floor space in mechanical rooms, basements, garages and utility areas.

    150,000 Maximum BTU Input
    95% AFUE Efficiency
    10:1 Turndown Ratio
    Heating-only boiler: The NKB150N heats water for a hydronic space-heating system. It does not produce domestic hot water directly like a Lochinvar NKC combi boiler. The NKB150N may be incorporated into a properly designed system with a compatible indirect water heater when domestic hot-water production is needed.

    Key Features

    • 150,000 BTU maximum input for residential heating loads
    • 15,000 BTU minimum input for efficient low-load operation
    • 95% AFUE high-efficiency condensing performance
    • 10:1 modulation turndown ratio for improved comfort
    • Durable ASME stainless steel fire-tube heat exchanger
    • Low pressure-drop design provides greater piping flexibility
    • SMART CONTROL™ digital operating control
    • Outdoor-reset control capability
    • Built-in cascading sequencer for systems with multiple boilers
    • Universal connector supports several approved vent materials
    • Compact wall-mounted configuration saves floor space
    • ENERGY STAR® certified residential boiler

    Ideal Applications

    Radiant Floor Heating Provides controlled hot-water temperatures for comfortable and efficient in-floor radiant heating systems.
    Multi-Zone Hydronic Systems Suitable for homes with several independently controlled heating zones and varying heating demands.
    Baseboard and Radiator Heating Can supply properly designed hydronic baseboard, panel radiator and traditional radiator systems.
    Hydro-Air Systems Can serve as the heat source for compatible air handlers equipped with hydronic heating coils.

    Designed for Radiant Floor Heating

    The Noble NKB150N is well suited for residential hydronic radiant-floor heating installations. Its modulating burner adjusts boiler output as heating demand changes, helping maintain more consistent system-water temperatures and reducing unnecessary cycling.

    When paired with properly sized manifolds, pumps, mixing controls and zoning components, the NKB150N can provide heat for multiple rooms, floors or heating zones from one central boiler.

    Technical Specifications

    Manufacturer Lochinvar
    Model NKB150N
    Product Type Wall-mounted condensing fire-tube boiler
    Application Hydronic space heating
    Fuel Type Natural gas
    Maximum Input 150,000 BTU/hr
    Minimum Input 15,000 BTU/hr
    DOE Heating Capacity 139,000 BTU/hr
    Net AHRI Rating 121,000 BTU/hr
    Efficiency 95% AFUE
    Turndown Ratio 10:1
    Water Connections 1 inch
    Gas Connection 1/2 inch
    Vent Options 2-inch venting up to 50 equivalent feet or 3-inch venting up to 100 equivalent feet, subject to installation requirements
    Approved Vent Materials PVC, CPVC, polypropylene or approved stainless steel
    Electrical Supply 120 VAC, 60 Hz, single phase
    Approximate Dimensions 32-7/8" H × 17-1/16" W × 18" D
    Shipping Weight Approximately 132 lb.
    Heat Exchanger Warranty 10-year limited warranty
    Parts Warranty 5-year limited warranty
    ENERGY STAR® Certified Yes
    Altitude and system-sizing assistance: For installations above 4,500 feet, or for assistance determining whether this boiler is properly sized for your heating system, please call 1-800-663-7831 before ordering.
    Boiler selection should be based on a professional heat-loss calculation, not square footage alone. Installation, venting, gas connections, system piping, startup and combustion testing must be completed by a qualified heating professional in accordance with Lochinvar instructions and all applicable codes. Warranty coverage is subject to the manufacturer’s current terms and conditions.