Skip to Product Info
    • Navien NHB-H Series 150 MBH - High Efficiency Condensing - Heating Combi Boiler

    Combi Boiler | Navien NHB-H Series 150 MBH - High Efficiency Condensing

    Type: Combi
    Installed Price:Regular Price $9,669.00
    Financing Options - Pay over time

    Get a decision in seconds with no impact on your credit score. See if you pre-qualify. Apply Now

    Installation Pricing

    Every product you purchase from us includes the full cost of professional installation. Once your order is placed, our team will reach out to schedule the installation at a time that works best for you.

    We handle everything from removing the old equipment to installing and testing your new system, ensuring it’s set up safely and performing at its best.

    Your checkout covers the equipment and the labor—no surprise charges, no hidden fees. Installation is simply booked separately so we can coordinate the right technician and confirm any details about your home.

    Learn more

    Payment & Security

    Your payment is secure. We don’t store or see your card details.

      Pairs well with

      This combi boiler is built for high-efficiency heating applications, offering a modern, compact wall-hung design that allows for installation in smaller mechanical rooms or utility closets. With the 15:1 turndown ratio and dual stainless steel heat exchangers, the combi boiler can modulate its output to closely match the heating load, reducing energy waste, avoiding frequent on/off cycling, and increasing comfort.

      The combi boiler's advanced control panel allows easy setup, monitoring and integration with multiple heating zones. The venting flexibility (including use of PVC/CPVC piping) makes it installer-friendly for retrofit applications. Durable construction, high efficiency and controllability make it a premium choice for residential or light commercial hydronic heating systems.

      Key Features & Highlights

      High-efficiency condensing boiler designed for space-heating applications; wall-hung indoor design.
      Industry-leading turndown ratio of 15 :1, enabling modulation of output to match heating load and reduce cycling.

      Annual Fuel Utilization Efficiency (AFUE) of 95%, meaning it converts ~95% of fuel energy into useful heat.

      Dual stainless steel heat exchangers (primary and secondary) for durability, corrosion resistance and enhanced performance.

      Compact dimensions (approx. 17.3″ W × 23.8″ H × 12.8″ D) and weight around 80 lbs (36.3 kg) for the 150 MBH model.

      Supports advanced built-in controls: integrated zone pump or zone valve control (e.g., boiler pump + up to 3 zone pumps or 3 zone valves) via the built-in PCB.

      User-friendly interface: backlit front panel, click-wheel control, intuitive text display and setup wizard.

      Venting flexibility: supports 2″ venting up to ~65 ft, and 3″ venting up to ~150 ft (with Sch.40 PVC/CPVC/approved polypropylene) under certain conditions.

      Field-convertible gas system: supports natural gas or liquid propane, plus a negative-pressure regulating gas valve and dual venturi for consistent air/gas ratio even under low-gas-pressure conditions.

      Suitable for retrofit and new installations where space is limited or wall‐mounting is desired.

      Technical Specifications (150 MBH Model)

      Maximum input: up to 150,000 BTU/h (≈ 44 kW)

      Heating capacity (DOE rating): ~138,000 BTU/h (≈ 40.4 kW)

      Net AHRI rating (water): ~120,000 BTU/h.

      Venting: forced-draft direct-vent; can use 2″ or 3″ PVC/CPVC/approved plastic venting under correct conditions.

      Weight: ~80 lbs (≈ 36.3 kg) for this model.

      We service and install all types of HVAC heating and cooling equipment throughout Long Island, including (but not limited to) this coverage area:

      Nassau County: Oyster Bay, Hempstead, North Hempstead, Glen Cove, Long Beach, Freeport, Valley Stream, Garden City, Great Neck, Mineola, Hicksville, Levittown, Massapequa, Bethpage, Plainview, Syosset, Jericho, Westbury, Rockville Centre, Farmingdale

      Suffolk County: Huntington, Babylon, Islip, Smithtown, Brookhaven, Riverhead, Shelter Island, Southold, Southampton, East Hampton, Commack, Deer Park, Lindenhurst, Bay Shore, Brentwood, Central Islip, Hauppauge, Centereach, Selden, Medford, Patchogue, Shirley

      Contact us today at (631) 779-3196

      Product Specifications
      Specification Name Specification Value
      Boiler system Combi
      Color pattern White
      Mounting type Wall
      Power source Natural gas, Propane
      Boiler Type Combi
      Product Type Condensing Heating-Only
      Fuel Type Natural Gas or Propane
      Capacity
      BTU Rating 150000
      Amperage 8.0
      MBH 150
      Efficiency 95%
      Voltage 120 V
      Turndown Ratio 15:1
      AFUE 95.0
      Installation Type Wall Hung
      Vent Type Direct Vent or Non-Direct Vent
      Burner Type
      Sections single
      Height 27.4 in
      Width 17.3 in
      Depth 13.2 in
      Documents
      Specification Sheet Download
      Service & Support

      Recently viewed

      Last seen items