Navien H-Series Combi-boilers

Price Range: $$$
Starting at $3294.99


Type: Combi-boiler
Fuel Type: Propane | Natural Gas
Capacity: On Demand - Endless

Product Details

Finally, a combi-boiler strong enough to support heating and DHW for the whole house

Navien NCB is the first high efficiency tankless condensing combination boiler with the capacity to supply both heat and domestic hot water for larger homes — enough hydronic heat for a whole house, plus hot water to run two showers and a dishwasher all at the same time. The Navien NCB takes up 80% less space than a traditional floor standing boiler and tank water heater. 

Available in three capacities to meet your needs:

  • Model NCB-180: ​3.4 GPM @ 77° (DHW)
  • Model  NCB-210: ​4.0 GPM @ 77° (DHW)
  • Navien NCB-240: ​4.5 GPM @ 77° (DHW)


Compare these advantages to any tankless condensing combi system:

Dual inputs of up to 120k BTU/h for
heating and 199k BTU/h for DHW

Supplies all the heat and domestic hot water that most houses require.
3.4 GPM@77° temperature rise
for domestic hot water

Separate stainless steel flat plate heat exchanger for DHW creates the highest flow rate for any combi‑boiler in the industry.
Turn down ratio of 6:1 for heating
and 11:1 for DHW

The sophisticated gas flow control system provides a high turn down ratio, reducing energy waste and excessive boiler cycling and enhances temperature control for DHW.
Dual stainless steel
heat exchangers

Resist corrosion better than copper to provide longer life.
Field gas

Dual venturi system allows for easy field convertibility from NG to LP operation.
Orifice for LP conversion included.
PVC venting
Low exhaust gas temperatures allows use of PVC, CPVC, ULC S636 and polypropylene vent systems, reducing installation time and costs. System can use 2" venting for up to 60', or up to 150' with 3" venting.
Low gas pressure operation
Our negative pressure gas valve ensures maximum performance all the way down to a minimum gas pressure of 3.5" of water column.
Uses existing ½" gas piping
Save time and effort in retrofit applications with ½" gas lines for up to 24'.
Space saving design
Occupies 80% less space than a traditional floor standing boiler and tank water heater.
For extraordinarily large domestic hot water flow demand, the NCB can be cascaded with our NPE units.

Additional Resources