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Residential Condensing Boilers

High Efficiency

Navien high efficiency condensing boilers provide whole house heating for small and large homes

Wall-mounted residential boilers from Navien save space and energy.

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NHB-H Series

Navien NHB boilers offer homeowners industry-leading turndown ratios, greater installation flexibility, and heating capacity for home of all sizes.

  • Dual stainless steel heat exchangers
  • Integrated control panel
  • Supports independent heating zones
  • Compact size perfect for tight spaces & retrofits
  • Four different models with BTU ranging from 55,000 - 150,000
  • Dual certified for single and 2-pipe venting
  • Common venting up to 8 units
  • Cascading up to 16 units
  • Up to 15:1 turndown ratio
  • Wi-Fi compatible

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NHB-H Series

NHB-H series residential heating boiler

NFB-H Series

Navien NFB-H boilers are the most advanced condensing fire tube boilers on the market, with heating capacity for any size home.

  • Patented stainless steel fire tube heat exchanger
  • Simplified installation thanks to built-in powered connections for 3 zone pumps or valves
  • Advanced user interface with intuitive control panel & Setup Wizard
  • Approved for high altitude up to 10,100 ft.
  • Dual certified for direct & non-direct venting
  • Common venting up to 8 units
  • Cascading up to 16 units
  • Up to 15:1 turndown ratio
  • Wi-Fi compatible

Lear More about the
NFB-H Series

NFB‑H image

What is boiler turndown ratio?

For boiler heating systems, the turndown ratio refers to the ability of the boiler to operate at lower output levels compared to its maximum capacity. “Turndown” describes the ratio between the boiler's highest and lowest firing rates. For example, if a home boiler has a turndown ratio of 15:1 it means that the boiler can modulate heat output down to one-fifteenth (less than 7%) of its maximum output.

A higher turndown ratio is a big advantage because it provides home heating with much more flexibility, comfort and efficiency. With a higher turndown ratio, a boiler can:

More accurately meet the heat demand of the home
Use energy more efficiently
Avoid frequent on/off cycling (which wastes energy and increases wear & tear on the system)
Operate at lower firing rates when heat demand is low (for example during mild weather)

Turndown ratio is an important feature of boiler heating systems because it allows for more precise control and directly relates to efficiency, performance, and responsiveness to heating demands.

Navien residential boilers have up to a 15:1 turndown ratio. In comparison, traditional boilers have a turndown ratio ranging from 4:1 to 6:1.


A new energy-efficient take on an old-fashioned system

All Navien new NHB-H and NFB-H boilers have Navien’s advanced burner system. The industry-leading turn down ratios maximize heating and energy efficiencies.

  • Much more energy-efficient than
    traditional boiler systems
  • The highest energy efficiency in the industry
    — up to 95% AFUE
  • Energy Star certified
  • Backed by the industry’s strongest warranty
    — 10 years on heat exchangers
  • Easy to use control panel
  • ​​Longer lasting than traditional floor standing boilers
  • Elegant, clean appearance
  • Improves home resale value
  • Ideal for boiler replacements or new construction
  • Takes up about 80% less space than
    traditional floor standing boilers


Conventional Boilers Lose Heat
Condensing Boilers Retain It

Reduce energy costs and greenhouse gasses with Navien high- efficiency condensing boilers. Condensing boilers operate more efficiently than traditional boilers because they have a stainless steel heat exchanger that captures heat from exhaust vapor, and transfers the recovered heat energy to the water circulating in the hydronic heating system.

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    High-efficiency boilers

    Condensing technology in the stainless steel heat exchangers of Navien hydronic boilers saves energy, reduces green house gasses and resists corrosion.

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    Small Footprint

    Both the NFB-H Series and NHB Series boilers have a sleek wall‑hung design and are substantially lighter than traditional boilers, making installation a lot easier.

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    Control from Your Phone

    Optional NaviLink™ Wi-Fi control system gives you access to your NHB and NFB-H boiler from anywhere in the world

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    Low Cost Installation

    Low exhaust gas temperatures allow the use of PVC, CPVC, ULC S363, PP, and SS, reducing installation time and costs. The system can use 2" venting for up to 60', or 3” venting up to 150', for greater installation flexibility.

  • Nhb-h-feature-indirect-wh

    Capable of heating a separate indirect water heater

    To meet all the home’s domestic hot water needs.

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    Precise Temperature Adjustment

    Turndown ratio up to 15:1 on NHB and NFB-H tankless boilers – the sophisticated gas flow control system provides a high turn down ratio which reduces energy waste and excessive boiler cycling while also enhancing temperature control for DHW.

wall-mounted Navien boiler heating system replaces larger floor-standing boiler

Navien Home Boilers Applications

Space saving design occupies up to 80% less space than a traditional floor standing boilers.

Navien gas boilers are compatiable with:

  • Radiators
  • Baseboard radiators
  • Radiant floor heating systems
  • Fan-coil units
  • Hydronic air handlers
Navien eco friendly boilers reduce greenhouse gas emissions

Protect the Environment as You Heat Your Home

Navien primary condensing stainless steel heat exchangers recover extra heat that would be lost in non-condensing boilers to reduce energy consumption and CO₂ emissions. This also keeps exhaust temperatures very low — so low that economical Schedule 40 PVC pipe can be used for venting in almost all applications.

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Navien residential boilers provide comfortable and energy-efficient home heating
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