Navien NCB-240E Condensing Gas Combination Boiler (NCB)

Features:

• Super condensing efficiency
• Dual stainless steel heat exchangers
• SCH40, 2″ PVC venting up to 60′
• ½” Gas pipe up to 24′
• Automatic water filling system
• integrated controls

Ultra Condensing Efficiency

• Navien’s Condensing Technology offers the high efficiency.
• Money and energy savings over tank type water heaters and traditional water heaters.

Two Stainless Steel Heat Exchangers

• Provides longer life expectancy as they are highly resistant to corrosion and erosion compared to copper heat exchangers.
• Reduces minerals deposits.

Low NOx Emissions (≤ 20ppm)

• New metal fiber burner is designed to deliver a consistent air/gas mixture improving combustion efficiency.
• Result in less acid rain and less green house effect.
• Comply with SCAQMD 1146.2 strict NOx emissions standard.

2″ PVC, CPVC, Polyprophylene Venting Up To 60′

• 2″ venting option allows for a flue to be pulled through the existing vent.
• 3″ vents can be used up to 150′ with standard 2″ x 3″ adapters.

Utilizes Existing 1/2″ Gas Line

• The negative pressure gas valve and fan with dual venturi operation allows for better adaptability to low gas pressure applications.
• Makes it possible for the NPE to be installed ½” gas lines up to 24′.

Field Convertible

• NCB models allow for easy convertibility from NG to LP.

Where Technology Meets Ecology, Combination Boiler

• The ideal solution for customers who need both domestic hot water and a space heating application.
• Heats water when needed, making it environmentally sound as well as cost efficient.

Hydronic Heating Benefits

• Clean: little chance to cause dust or lower humidity because there is no air movement.
• Silent: offers silent heating because no blowers are needed for forced circulation.
• Comfort: keeps floors warm but indoor air fresh, making people feel warm and comfortable.
• Coverage: radiant heat makes heating from floor to ceiling possible.
• Economical: radiant heat in the floors can transmit warmth throughout the house hours after turning off the heater.

Automatic Water Filling System

• Automatically fills water into space heating pipes when the unit senses a water shortage.

Powerful Anti-Freeze Feature

• The Combi’s built-in Control System is designed to keep the unit’s plumbing frost free in winter conditions.

Specifications:

• Gas Input
  • Space Heating: 18,000–120,000 BTU/H
  • Domestic Hot Water: 18,000–199,900 BTU/H
• AFUE: 95.0%
• Flow Rate (DHW)
  • 77°F (43°C) Temp Rise: 4.5 GPM (17.0 L/m)
• Dimensions: 17″(W) x 28″(H) x 12″(D)
• Weight: 84 lbs (38kg)
• Installation Type: Indoor wall-hung
• Venting Type: Forced draft direct vent
• Ignition: Electronic ignition
• Water Pressure (Hydronic/DHW): 12–30 PSI /15–150 PSI
• Natural Gas Supply Pressure (from source): 3.5″ –10.5″ WC
• Propane Gas Supply Pressure (from source): 8.0″ –13.5″ WC
• Natural Gas Manifold Pressure (min to max): -0.06″ WC / -1.20″ WC
• Propane Gas Manifold Pressure (min to max): -0.03″ WC / -0.98″ WC
• Minimum Flow Rate (DHW): 0.5 GPM (1.9 L/m)
• Connection Sizes
  • Heating Supply/Return: 1″ NPT
  • DHW Inlet/Outlet: 3/4″ NPT
  • Gas Inlet: 3/4″ NPT
  • Auto Feeder: 1/2″ NPT
  • Condensate Outlet: 1/2″ NPT
• Power Supply
  • Main Supply: 120V AC, 60Hz
  • Maximum Power Consumption: 200W (up to 2 amperes)
• Materials
  • Casing: Cold rolled carbon steel
  • Heat Exchangers: Primary/secondary heat exchanger: stainless steel DHW heat exchanger: stainless steel
• Venting
  • Exhaust: 2″ or 3″ PVC, CPVC, approved polypropylene 2″ or 3″ [special gas vent type BH (Class II, A/B/C)
  • Intake: 2″ or 3″ PVC, CPVC, polypropylene 2″ or 3″ specialty gas vent type BH (Class II, A/B/C)
  • Vent Clearances: 0″ to combustibles
• Safety Devices
  • Flame rod, APS, gas valve operation detector, ignition operation detector, water temperature high limit switch, exhaust temperature high limit sensor