Navien NCB-210

    Navien makes the NCB-210 combi-boiler based off of their tried, tested, and effective, tankless water heater. The Navien NCB-210 system is powerful, dependable, and strong enough to support all your homes heating and domestic hot water needs.

    How It Works

    The Navien NCB-210 uses a very similar design to that of NPE tankless water heater except that instead of heating the homes water in the primary and secondary heat exchangers it heats glycol or water contained within the heating loops.

    Inside the NCB-210 is a small, but highly efficient heat exchanger that is able to transfer heat from the glycol or water to your homes domestic hot water pipes. This is done with complete isolation so that glycol or water contamination is nearly impossible. Yes, this does work out to be a little less efficient than directly heating your homes water though the primary and secondary heat exchangers but the difference is negligible. See the chart below for hot water production loss between a Navien tankless and the Navien combi-boiler.

    Navien Model77 °F Water Temp Rise
    NCB-180 (Combi)3.4 GPM (12.9 L/m)
    NPE-180 (Tankless)3.8 GPM (14.3 L/m)
    NCB-210 (Combi)4.0 GPM (15.1 L/m)
    NPE-210 (Tankless)4.6 GPM (17.4 L/m)
    NCB-240 (Combi)4.5 GPM (17.0 L/m)
    NPE-240 (Tankless)5.0 GPM (12.9 L/m)

    Combi-Boiler Priorities and Settings

    So it’s the middle of winter, what happens when the boiler is heating your home and someone starts the shower? The combi system will sense this double demand and shift the priority from home heating to hot water production. You can run two showers and your dishwasher at the same time and still have extra hot water. Once demand drops for hot water the system will automatically focus on heating your home again. The interruption is nearly invisible; it’s really quite amazing how well it works.

    Types of Heating

    One of the greatest benefits of a Navien combi boiler is the fact they are so expandable and adaptable. If you are running a conventional forced air gas, oil, or propane furnace a combi-boiler with the addition of a simple heat exchanger and blower (air handler) can use your homes existing duct work. Want to add some radiant floor heating to your bathroom in a few years? Not a problem, the combi-boiler can run that as well. Need heat in a new spot but don’t have any room or way to run conventional ductwork, try a stylish antique rad. The Navien NCB 210 is a completely expandable system that will provide years of use for any home owner with future plans for renovations.

    boiler types


    The combi-boiler from Navien is highly efficient at around 91-93 percent. So every dollar you spend on fuel 91 cents are actually being used for heat. This is a drastic departure from even just 10 or 20 years ago when furnace systems would send 30 to 40 cents out the exhaust pipe, completely wasted.

    Space Savings – This system simply hangs on your wall, no need for a storage hot water tank. This simple change can save you a ton of room in your home.  On top of that, depending on your application you may be able to completley remove your furnace system as well.

    Chimney Removal – Before I moved to the NCB Combi Boiler I had a cinder block chimney going straight up through the middle of my house.  Once the Navien was installed the venting simply went right out the side of the house.  The chimney then became completely redundant and I was able to remove it freeing up 8 square feet per floor.


    • PVC venting
    • Low gas pressure operation
    • Turn down ration of 6:1 for heating
    • Turn down ration of 11:1 for water heating
    • Dual stainless heat exchangers
    • Space saving design
    • Expandable and linkable
    • Easy conversion from natural gas to propane
    • Integrated boiler pump


    You can buy the unit and either install it yourself (We wouldn’t recommend this but maybe you know a licensed gas fitter and plumber).

    Interested in a Navien NCB-210 Combi-boiler for your home?

    We have professional installers and the know how needed to get the job done right.

    Call: 647 925 1930 — Or have us call you.. fill out our form