Navien NCB-240-110H High Efficiency Condensing Combi-Boiler

Heating Input Min.

13,000 BTU/h (3.8 kWh)

Heating Input Max.

110,000 BTU/h (32.2 kWh)

Heating Capacity2

102,000 BTU/h (29.9 kWh)

Net AHRI Rating, Water3

89,000 BTU/h (26.1 kWh)

AFUE2, %

95.0

Water Connection Size (Supply, Return)

1"

Input Ratings Min.

13,000 BTU/h (3.8 kWh)

Input Ratings Max.

199,900 BTU/h (58.6 kWh)

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

7.9 GPM (29.9 l/m)

DHW Connection Size (Supply, Return)

3/4"

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)

-0.06 " WC to -0.24 " WC (-0.015 Kpa to -0.06 Kpa)

Propane gas manifold pressure (min-max)

-0.06 " WC to -0.26 " WC (-0.015 Kpa to -0.065 Kpa)

Power supply

120V AC, 60Hz (Up to 15 amperes)

Materials

Cold-rolled carbon steel (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

Temperature setting range

86 - 140 °F (30 - 60 °C) (up to 0 °F ( °C) when setting the parameter)

Safety Devices

Flame Rod, APS, Ignition operation detector, water temperature high limit switch, exhaust temperature high limit sensor, water pressure sensor, burner