Navien NCB-240E Boiler
- Max Input: 199,900 BTU/H
- Indoor or outdoor wall-hung
- Residential
- 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
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Navien NCB-E is the first high efficiency 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-E saves installation time and reduces call backs. In addition, the NCB-E takes up 80% less space than a traditional floor standing boiler and tank water heater. Your customer now has more room, saves energy and enjoys all the hot water they need, whenever they want it.
NCB-E Series Condensing Combi Boilers
| Item |
NCB-240E |
| Summary |
- 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
|
| Gas Input |
Space heating |
18,000 – 120,000 (BTU/H) |
| Domestic hot water |
18,000 – 199,900 (BTU/H) |
| Flow rate (DHW) |
77°F (43°C) temp rise |
4.5 GPM (17.0 L/m) |
| Dimensions |
17.0″ W x 28.0″ H x 12.0″ D |
| Weight |
84lbs (38kg) |
| Installation Type |
Indoor or outdoor wall-hung |
| Venting Type |
Forced draft direct vent |
| Ignition |
Electronic ignition |
| Hydronic water pressure |
12.0-30.0 PSI |
| DHW water pressure |
15.0-150.0 PSI |
| Natural gas supply pressure (from source) |
3.5″ WC to 10.5″ WC |
| Propane gas supply pressure (from source) |
8″ WC to 13″ WC |
| Natural gas manifold pressure (min-max) |
-0.06″ WC to -1.2″ WC |
| Propane gas manifold pressure (min-max) |
-0.03″ WC to -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 (max 2A) |
| Materials |
Casing |
Cold rolled carbon steel |
| Heat exchanger |
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″ special gas vent type BH (Class II, A/B/C) |
| Vent clearances |
0″ to combustibles |
| Safety Devices |
Flame rod, APS, ignition operation detector, water temperature high limit switch,exhaust temperature high limit sensor, power surge fuse |
Advantages
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.
PVC Venting
Low exhaust gas temperatures allow use of PVC, CPVC, ULC S636 and polypropylene vent systems, reducing installation time and costs. The system can use 2″ venting for up to 60′, or up to 150′ with 3″ venting.
4.5 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.
Low gas pressure operation
Our negative pressure gas valve ensures maximum performance all the way down to the minimum gas pressure of 3.5″ of the water column.
Turn down ratio of 6:1 for heating and 11:1 for DHW
The sophisticated gas flow control system provides a high turndown ratio, reducing energy waste and excessive boiler cycling and enhances temperature control for DHW.
Uses existing ½” gas piping
Save time and effort in retrofit applications with ½” gas lines for up to 24′.
Dual stainless steel heat exchangers
Resist corrosion better than copper to provide longer life.
Space saving design
Occupies 80% less space than a traditional floor standing boiler and storage tank.
Field gas convertibility
Dual venturi system allows for easy field convertibility from NG to LP operation. Orifice for LP conversion included.
Linkability
For extraordinarily large domestic hot water flow demand, the NCB-E can be cascaded with our NPE units.
NCB-E Applications
NCB-E Applications
- Air Handler
- Hydronic Heating
- Hydronic fan coil
- Baseboard radiator
- Radiant floor
Manifold Kits
Manifold Kits
For fast installation and maximum efficiency, install our system matched manifold kits.
Optional Wi-Fi remote control system
Optional Wi-Fi remote control system
NaviLink makes it easy to communicate with your Navien systems anywhere internet service is accessible. The NaviLink module attaches easily to any new or existing* Navien NPE Series tankless water heater, NCB-E Series combi‐boiler and NHB Series boiler.
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