Lochinvar – Noble Combination Gas Boiler/Space Heating Appliance

lochinvar boilers


Delivers both dependable hot water and soothing space heating in a single appliance.


Removing the front panel provides convenient access to the combustion system, control panel and key components. This simple-to-install-and-service combi boiler is making an impact on the industry. The unique fire tube heat exchanger design is what enables NOBLE to produce the results users deserve and have come to expect from Lochinvar.

  1. Adapter-Free Flue Connection
    Multi-material connector allows either PVC, CPVC, polypropylene or stainless steel connection directly to the appliance without adapters. NOBLE also has a built-in combustion analyzer port.
  2. Direct Venting Up to 100 Feet
    Offers five venting options for tremendous installation flexibility. It permits direct-vent air intake, and exhaust runs up to 100 equivalent feet using either PVC, CPVC, polypropylene or AL29-4C stainless steel vent pipe.
  3. Advanced Negative Regulation Technology
    Safely and reliably operates with supply gas pressure as low as 4 inches water column. Its negative regulation (neg/reg) technology eliminates mechanical dampers as it automatically adjusts fan speed to ensure the correct volume and mix of fuel and air throughout the firing range.
  4. Innovative Fire-Tube Heat Exchanger
    The fire tube design can produce a higher heat transfer coefficient than traditional fire tubes.
  5. Brazed Plate Heat Exchanger
    The stainless steel heat exchanger quickly transfers heat from the boiler system to the domestic water, satisfying DHW load.
  6. Water Connections for Easy Installation
    NPT water connections make installation easy, especially with our optional isolation valves.
Model Number Max Input (MBH) Min Input (MBH) *AFUE % Heating Capacity MBH Net AHRI MBH A B C D E F G Gas Conn. Water Conn. Air Inlet Vent Size Ship. Wt.
NKC110N 110 11 95 102 89 32-1/2″ 17-1/4″ 18″ 14-3/4″ 2-3/4″ 6-1/2″ 2-3/4″ 1/2″ 1″ 3″ 3″ 139
NKC150N 150 15 95 139 121 32-1/2″ 18-3/4″ 18″ 6-3/4″ 2-3/4″ 6-3/4″ 11-3/4″ 1/2″ 1″ 3″ 3″ 142
NKC199N 199 20 95 185 161 32-1/2″ 18-3/4″ 18″ 5-1/2″ 2-3/4″ 6-3/4″ 11-1/2″ 1/2″ 1″ 3″ 3″ 159