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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Description

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 e nv
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

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Advantages

<p><img loading="lazy" decoding="async" class=" wp-image-10926 alignright" src="https://cozycomfortplus.com/wp-content/uploads/2017/12/dual-input.png" alt="dual-input" width="126" height="91" /></p> <p><strong>Dual inputs of up to 120k BTU/H for heating and 199k BTU/H for DHW</strong><br /> Supplies all the heat and domestic hot water that most houses require.</p> <p><strong>PVC Venting</strong><img loading="lazy" decoding="async" class=" wp-image-10938 alignright" src="https://cozycomfortplus.com/wp-content/uploads/2017/12/pvc-venting.png" alt="pvc-venting" width="125" height="90" /></p> <p>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.</p> <p><strong>4.5 GPM@77° temperature rise for domestic hot water</strong><img loading="lazy" decoding="async" class=" wp-image-10929 alignright" src="https://cozycomfortplus.com/wp-content/uploads/2017/12/gpm.png" alt="gpm" width="126" height="91" /></p> <p>Separate stainless steel flat plate heat exchanger for DHW creates the highest flow rate for any combi boiler in the industry.</p> <p><strong>Low gas pressure operation</strong><img loading="lazy" decoding="async" class=" wp-image-10930 alignright" src="https://cozycomfortplus.com/wp-content/uploads/2017/12/low-gas-pressure.png" alt="low-gas-pressure" width="125" height="90" /></p> <p>Our negative pressure gas valve ensures maximum performance all the way down to the minimum gas pressure of 3.5″ of the water column.</p> <p><strong>Turn down ratio of 6:1 for heating and 11:1 for DHW<img loading="lazy" decoding="async" class=" wp-image-10939 alignright" src="https://cozycomfortplus.com/wp-content/uploads/2017/12/ratio.png" alt="ratio" width="131" height="94" /></strong><br /> The sophisticated gas flow control system provides a high turndown ratio, reducing energy waste and excessive boiler cycling and enhances temperature control for DHW.</p> <p> </p> <p><strong>Uses existing ½” gas piping</strong></p> <p><img loading="lazy" decoding="async" class=" wp-image-10928 alignright" src="https://cozycomfortplus.com/wp-content/uploads/2017/12/gas-pipes.png" alt="gas-pipes" width="136" height="98" />Save time and effort in retrofit applications with ½” gas lines for up to 24′.</p> <p> </p> <p> </p> <p><strong>Dual stainless steel heat exchangers</strong><img loading="lazy" decoding="async" class=" wp-image-10925 alignright" src="https://cozycomfortplus.com/wp-content/uploads/2017/12/dual-heat-exchange.png" alt="dual-heat-exchange" width="135" height="97" /></p> <p>Resist corrosion better than copper to provide longer life.</p> <p> </p> <p><img loading="lazy" decoding="async" class=" wp-image-10924 alignright" src="https://cozycomfortplus.com/wp-content/uploads/2017/12/contractor-ncb.png" alt="contractor-ncb" width="146" height="105" /></p> <p><strong>Space saving design</strong><br /> Occupies 80% less space than a traditional floor standing boiler and storage tank.</p> <p> </p> <p><strong>Field gas convertibility</strong><img loading="lazy" decoding="async" class=" wp-image-10927 alignright" src="https://cozycomfortplus.com/wp-content/uploads/2017/12/field-gas.png" alt="field-gas" width="137" height="99" /></p> <p>Dual venturi system allows for easy field convertibility from NG to LP operation. Orifice for LP conversion included.</p> <p> </p> <p><strong>Linkability</strong></p> <p><img loading="lazy" decoding="async" class=" wp-image-10942 alignright" src="https://cozycomfortplus.com/wp-content/uploads/2017/12/linkability.png" alt="linkability" width="135" height="98" />For extraordinarily large domestic hot water flow demand, the NCB-E can be cascaded with our NPE units.</p>

NCB-E Applications

<p><strong>NCB-E Applications</strong></p> <p><img loading="lazy" decoding="async" class=" wp-image-10932 alignright" src="https://cozycomfortplus.com/wp-content/uploads/2017/12/NCB-E-Applications-.png" alt="NCB-E Applications" width="295" height="217" srcset="https://cozycomfortplus.com/wp-content/uploads/2017/12/NCB-E-Applications-.png 902w, https://cozycomfortplus.com/wp-content/uploads/2017/12/NCB-E-Applications--510x376.png 510w, https://cozycomfortplus.com/wp-content/uploads/2017/12/NCB-E-Applications--300x221.png 300w, https://cozycomfortplus.com/wp-content/uploads/2017/12/NCB-E-Applications--768x566.png 768w" sizes="(max-width: 295px) 100vw, 295px" /></p> <ul> <li>Air Handler</li> <li>Hydronic Heating</li> <li>Hydronic fan coil</li> <li>Baseboard radiator</li> <li>Radiant floor</li> </ul>

Manifold Kits

<p><strong>Manifold Kits</strong><br /> For fast installation and maximum efficiency, install our system matched manifold kits.<img loading="lazy" decoding="async" class="wp-image-10943 alignright" src="https://cozycomfortplus.com/wp-content/uploads/2017/12/secondary-manifold-1.png" alt="" width="258" height="223" /></p> <p><img loading="lazy" decoding="async" class="wp-image-10931 alignleft" src="https://cozycomfortplus.com/wp-content/uploads/2017/12/Manifold-Kits.png" alt="Manifold Kits" width="168" height="188" srcset="https://cozycomfortplus.com/wp-content/uploads/2017/12/Manifold-Kits.png 306w, https://cozycomfortplus.com/wp-content/uploads/2017/12/Manifold-Kits-268x300.png 268w" sizes="(max-width: 168px) 100vw, 168px" /></p>

Optional Wi-Fi remote control system

<p><strong>Optional Wi-Fi remote control system</strong><br /> 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.</p>

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