Navien NCB-190/080H – Condensing Combi-Boiler – 160,000 BTU DHW / 80,000 BTU HTG 
The Navien NCB-190/080H is a high-efficiency condensing combi-boiler that delivers both hydronic space heating and domestic hot water from a single, compact wall-hung unit. With a 95% AFUE rating and up to 80,000 BTU/hr heating input, it provides consistent warmth and efficiency for a wide range of home sizes. The domestic hot water system delivers up to 160,000 BTU/hr with a 15:1 turndown ratio and 4.3 GPM flow rate at a 37°C rise, supporting simultaneous use across multiple fixtures.
Constructed with dual stainless steel heat exchangers for long-term durability and corrosion resistance, the NCB-190/080H is equipped with smart control features, built-in pumps, and field conversion capability between natural gas and propane. It supports cascading and common venting with NPE water heaters, making it an adaptable solution for residential heating and hot water needs.
Features:
95% AFUE energy efficiency
160,000 BTU/hr DHW input and 80,000 BTU/hr heating input
Dual stainless steel heat exchangers
15:1 DHW turndown ratio
Smart control with Setup Wizard and backlit LCD
Built-in zone pumps and zone valve terminals
Compatible with cascading and common venting setups
Field convertible for natural gas or propane
Compact wall-hung design
Flexible 2″ or 3″ venting options
Applications:
Whole-house hydronic space heating
On-demand domestic hot water
Homes using natural gas or propane
New construction or system replacements
Residences requiring compact, wall-mounted heating solutions
Installations requiring energy-efficient and low-maintenance operation
 
Aim high with Navien…
High efficiency, High output, High performance, all in one compact combi
Highest DHW maximum BTU’s in residential combi-boilers…up to 210,000 per hour
Highest DHW flow rate @ 70°F rise…up to 5.4 GPM
Highest number of BTU sizes for the North American residential combi-boiler market
Highest residential combi DHW TDR…15:1 for all models
Highest residential combi heating TDR… up to 11:1
Highest number of built-in zone controls for valves or pumps… up to three
Highest full lineup 2″ PVC venting lengths… up to 65 feet
Highest number of cascade capable units with NPE tankless water heaters… up to 15
High altitude certification… up to 10,100 feet (NG or LP)
Lowest minimum fire BTU for residential combi-boilers… as low as 10,700
New Navien NCB-H…the complete combi package and no comprimises
Navien’s innovation and technological advancements have done it again. The new NCB-H is taking combi performance to the highest levels. As the competition tries to get closer, Navien ingenuity keeps advancing their lead.
COMPARE these advantages and see why NCB-H combis are the right fit for small and large homes
Dual stainless steel heat exchangers for heating
Durable stainless steel heat exchangers resist corrosion, resulting in longer life and improved heat recovery from flue gases for superior efficiency.
Up to 5.4 GPM @ 70°F temperature rise for DHW
Separate stainless steel flat plate heat exchanger for DHW creates the lightest flow rates for any combi-boiler in the industry.
Dual Venturi and field gas convertibility
Dual Venturi system creates better combustion control and turndown ratio. Orifice conversion kit for easy field gas convertibility from NG to LP is included with every NCB-H Series combi-boiler.
Easy access to DHW module and valves
All components of DHW module including water feed valve, flow adjustment valve, mixing valve and 3-way valve are right behind circuit board for easy serviceability.
Low noise levels
Installations in or near media rooms, recreation rooms or any living areas of the house are possible with the quiet running NCB-H combi-boilers.
TDR 15:1 for DHW and up to 11:1 for heating
The sophisticated gas flow control system provides a high turndown ratio, reducing energy waste and excessive boiler cycling and enhances temperature control for DHW.
 
Dual Stainless Steel
Heat Exchanger
Designed for exceptional
heating performance and longevity
Heating up to
150,000
BTUs per hour
 
Built-in DHW module now withhigher performanceNavien’s NCB-H generates enough hot water to run up to 3 showers and a dishwasher at the same time.
 
Expanded DHW Capability
For increased domestic hot water flow demand, the NCB-H can be cascaded and common vented with up to 15 NPE tankless water heaters
 
 
ZNS