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Quick answer: The Navien NCB Series is a wall-hung condensing gas combi boiler: one unit provides both space heating and domestic hot water, so it can replace a boiler and a separate water heater. Navien specifies stainless steel primary, secondary and domestic hot water heat exchangers. Airmax installs and services NCB units and is CT licensed HTG.0414617-D1.
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| Type | Condensing gas combination boiler — space heating plus domestic hot water |
|---|---|
| Heat exchangers | Stainless steel primary/secondary; stainless steel domestic hot water heat exchanger |
| Mounting | Wall-hung, which frees the floor space a tank system occupies |
| Venting | PVC venting per the Navien installation manual |
| Fuel | Natural gas or propane, per model configuration |
Source: Navien NCB Series specification sheet. Figures are the manufacturer's published values and vary by model; confirm the exact model on your quote. Airmax installs and services this equipment.
A combi unit makes hot water on demand instead of storing it, so there is no tank to keep hot and no tank to fail. That suits a home replacing an aging boiler and an aging water heater at the same time, or a home short on mechanical-room space. Homes with very high simultaneous hot-water demand — several showers plus a tub fill at once — sometimes still do better with storage, which is a sizing question to settle before the equipment is ordered.
Navien's NPE Series is a tankless water heater. Navien states that water heaters cannot be used in space-heating-only applications. If the goal is to heat the house, the combi-boiler line (NCB) is the relevant product. Getting this wrong is a common source of confusion when homeowners compare quotes.
Heat-loss calculation and domestic hot water demand sizing, gas line capacity check, new PVC venting, condensate drainage and neutralization where required, near-boiler piping, and commissioning. Local permitting applies. Airmax handles permitting and the gas and venting work as part of the installation.
A combination boiler heats the home and produces domestic hot water on demand from a single wall-hung unit, so no separate hot water tank is needed.
The NCB Series is a condensing combi boiler that provides both space heating and hot water. The NPE Series is a condensing tankless water heater; Navien states water heaters cannot be used for space-heating-only applications. For house heating, the NCB line applies.
That is the intended use case. Whether it fits a specific home depends on the heat loss and on peak simultaneous hot water demand, both of which are checked during sizing.
It heats water on demand rather than storing it, so it does not run out the way a tank does. It is limited by flow rate instead, which is why sizing to the home's fixture count matters.
Typically yes. Condensing boilers use their own venting, per the Navien installation manual, and a condensate drain path is also required.
Airmax Heating & A/C installs and services Navien equipment across Fairfield County, CT and Westchester County, NY. CT license HTG.0414617-D1, 24/7 service, free estimates. Call (866) 203-0469.
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Airmax Heating & A/C — CT license HTG.0414617-D1, fully insured, 24/7 service. Serving Stamford, Greenwich, Darien, New Canaan, Norwalk, Westport and Fairfield in Fairfield County, CT, and Rye, Port Chester, Mamaroneck and New Rochelle in Westchester County, NY. Free estimates on installations.