NCB-190/080H ultra-high efficiency combi-boiler

high efficiency Condensing Combi-Boiler

Smart controls LCD display, quick dial wheel & Setup Wizard
Advanced stainless steel dual heat exchangers
15:1 DHW and up to 7.3:1 heating TDR
Field convertible gas system (NG/LP) up to 10,100 ft.
Capable of cascading up to 15 NPE water heaters
Capable of common venting up to 7 NPE water heaters
Built-in 3 zone pumps and 3 zone valves powered connections
2” venting up to 65' and 3” venting up to 150'

NCB-190/080H premium features and benefits

2" PVC venting up to 65 feet including economical schedule 40 PVC.Vent Installation Detector (VID) for added safety.

Dual Venturi system creates better combustion control and turndown ratio and easy field gas conversions.

Dual stainless steel heat exchanger-c-new

Durable dual condensing stainless steel heat exchangers recover extra heat for maximum efficiency.

Advanced user interface with Setup Wizard is made easy with backlit panel, click-wheel control and intuitive text.

1/2" gas pipe capability up to 24' (subject to local codes). Cuts installation time, no need to install new gas lines for retrofit applications.

Easily accessible built-in DHW module includes integrated boiler pump, flow adjustment valve, DHW stainless steel heat exchanger, mixing valve and 3-way valve.

NCB-190/080H QuickFacts

Dimensions

17.3" W x 29.3" H x 12.8" D (43.9cm W x 74.4cm H x 32.5cm D)

Certification Summary

Product approvals

CSA: Yes
SCAQMD 1146.2(NOx, <20ppm): Yes
Low Lead(<0.25%, DHW only): Yes
ASME Certified: Yes "H" Stamp
AHRI Number: 205661697
Energy star certified: Yes

Space Heating Ratings

AFUE, %: 95.0
Heating Capacity: 74,000 BTU/h (21.7 kWh)

DHW Flow Rates

DWH Temp Rise	NCB-190/080H
35 °F (19.4 °C) rate	8.2 GPM (31 l/m)
40 °F (22.2 °C) rate	7.2 GPM (27.3 l/m)
45 °F (25 °C) rate	6.4 GPM (24.2 l/m)
50 °F (27.8 °C) rate	5.8 GPM (22 l/m)
55 °F (30.6 °C) rate	5.2 GPM (19.7 l/m)
60 °F (33.3 °C) rate	4.8 GPM (18.2 l/m)
67 °F (37.2 °C) rate	4.3 GPM (16.3 l/m)
70 °F (38.9 °C) rate	4.1 GPM (15.5 l/m)
77 °F (42.8 °C) rate	3.7 GPM (14 l/m)
80 °F (44.4 °C) rate	3.6 GPM (13.6 l/m)
85 °F (47.2 °C) rate	3.4 GPM (12.9 l/m)
90 °F (50 °C) rate	3.2 GPM (12.1 l/m)
100 °F (55.6 °C) rate	2.9 GPM (11 l/m)

Gas Input Ranges

Model	NCB-190/080H
Heating	11,000 - 80,000 BTU/h (3.223 - 23.44 kWh)
DHW	10,000 - 160,000 BTU/h (2.93 - 46.88 kWh)

Applications

For NCB-H technical drawings of specific installations and requirements please visit NavienInc.com

Temperature Setting Ranges

Item		Temperature Setting Range
Space Heating	Supply	77 - 185 °F (25 - 85 °C)
Space Heating	Return	68 - 158 °F (20 - 70 °C)
DHW		86 - 140 °F (30 - 60 °C)

Actual supply and return temperatures vary depending on the selected outdoor reset curve.

Ratings

Navien Combination Boiler Space Heating Ratings
Model¹		NCB-190/080H
Heating Input	Min	11,000 BTU/h (3.2 kWh)
Heating Input	Max	80,000 BTU/h (23.4 kWh)
Heating Capacity²		74,000 BTU/h (21.7 kWh)
Net AHRI Rating, Water³		64,000 BTU/h (18.8 kWh)
AFUE², %		95.0
Other Specifications
Water pressure	Min	12 PSI (0.8 kg/cm²)
Water pressure	Max	30 PSI (2.1 kg/cm²)
Water Connection Size (Supply, Return)		1"

Navien Condensing Boiler Domestic Hot Water Ratings
Model¹		NCB-190/080H
Input Ratings	Min	10,000 BTU/h (2.9 kWh)
Input Ratings	Max	160,000 BTU/h (46.9 kWh)
Other Domestic Hot Water Specifications
Water pressure	Min	15 PSI (1.1 kg/cm²)
Water pressure	Max	150 PSI (10.5 kg/cm²)
Minimum Flow Rate		0.5 GPM (1.9 l/m)
Flow Rate 45 °F (25 °C) Temp Rise		6.4 GPM (24.2 l/m)
DHW Connection Size (Supply, Return)		3/4"

¹ Ratings are the same for natural gas models converted to propane use.

² Based on U.S. Department of Energy (DOE) test procedures.

³ The net AHRI water ratings shown are based on a piping and pickup allowance of 1.15.

Consult Navien before selecting a boiler for installations having unusual piping and pickup requirements, such as intermittent system operation, extensive piping systems, etc.

Specifications

Item		NCB-190/080H
Dimensions		17.3" W x 29.3" H x 12.8" D (43.9cm W x 74.4cm H x 32.5cm D)
Boiler weight		87 lbs (39.5 kg)
Boiler Weight With Water		93 lbs (42.2 kg)
Installation type		Indoor wall-hung
Venting type		Forced draft direct vent
Ignition		Electronic ignition
Natural gas supply pressure (from source)		3.5 " WC to 10.5 " WC (0.87 Kpa to 2.61 Kpa)
Propane gas supply pressure (from source)		8 " WC to 13.5 " WC (1.99 Kpa to 3.36 Kpa)
Natural gas manifold pressure (min-max)		-0.01 " WC to -0.31 " WC (-0.0025 Kpa to -0.077 Kpa)
Propane gas manifold pressure (min-max)		-0.04 " WC to -0.33 " WC (-0.0099 Kpa to -0.082 Kpa)
Connection sizes	Gas inlet
Power supply	Main supply	120V AC, 60Hz
Power supply	Maximum power consumption	Up to 15 amperes
Materials	Casing	Cold-rolled carbon steel
Materials	Heat exchanger	stainless steel
Venting	Exhaust	2" or 3" PVC, CPVC, approved polypropylene 2" or 3" special gas vent type BH (Class III, A/B/C) 2" or 3" stainless steel
	Intake	2" or 3" PVC, CPVC, polypropylene 2" or 3" special gas vent type BH (Class III, A/B/C) 2" or 3" stainless steel
	Vent clearances	0" to combustibles
Safety Devices		Flame Rod, APS, Ignition operation detector, water temperature high limit switch, exhaust temperature high limit sensor, water pressure sensor, burner
Temperature setting range		86 - 140 °F (30 - 60 °C) (up to 0 °F ( °C) when setting the parameter)