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Lochinvar Noble NKB110N High-Efficiency Fire Tube Boiler
The Lochinvar Noble NKB110N is a high-efficiency, wall-mounted condensing boiler designed to provide dependable heat for residential hydronic systems. With a maximum input of 110,000 BTU and 95% AFUE efficiency, it delivers reliable heating performance while helping reduce natural gas consumption.
Its stainless steel fire-tube heat exchanger provides efficient heat transfer, low pressure drop and long-term corrosion resistance. The compact wall-mounted configuration also helps preserve valuable floor space in mechanical rooms, basements, garages and utility areas.
110,000
Maximum BTU Input
95%
AFUE Efficiency
10:1
Turndown Ratio
Heating-only boiler:
The NKB110N heats water for a hydronic space-heating system. It does
not produce domestic hot water directly like a Lochinvar NKC combi
boiler. The NKB110N may be incorporated into a properly designed
system with a compatible indirect water heater when domestic hot-water
production is needed.
Key Features
- 110,000 BTU maximum input for residential heating loads
- 11,000 BTU minimum input for efficient low-load operation
- 95% AFUE high-efficiency condensing performance
- 10:1 modulation turndown ratio for improved comfort
- Durable ASME stainless steel fire-tube heat exchanger
- Low pressure-drop design provides greater piping flexibility
- SMART CONTROL™ digital operating control
- Outdoor-reset control capability
- Built-in cascading control for systems with multiple boilers
- Universal connector supports several approved vent materials
- Compact wall-mounted configuration saves floor space
- ENERGY STAR® certified residential boiler
Ideal Applications
Radiant Floor Heating
Provides controlled hot-water temperatures for comfortable and
efficient in-floor radiant heating systems.
Multi-Zone Hydronic Systems
Suitable for homes with independently controlled heating zones and
varying heating demands.
Baseboard and Radiator Heating
Can supply properly designed hydronic baseboard, panel radiator and
traditional radiator systems.
Hydro-Air Systems
Can serve as the heat source for compatible air handlers equipped
with hydronic heating coils.
Designed for Radiant Floor Heating
The Noble NKB110N is well suited for residential hydronic radiant-floor heating installations. Its modulating burner adjusts boiler output as heating demand changes, helping maintain more consistent system-water temperatures and reducing unnecessary cycling.
When paired with properly sized manifolds, pumps, mixing controls and zoning components, the NKB110N can provide heat for multiple rooms, floors or heating zones from one central boiler.
Technical Specifications
| Manufacturer | Lochinvar |
|---|---|
| Model | NKB110N |
| Product Type | Wall-mounted condensing fire-tube boiler |
| Application | Hydronic space heating |
| Fuel Type | Natural gas |
| Maximum Input | 110,000 BTU/hr |
| Minimum Input | 11,000 BTU/hr |
| DOE Heating Capacity | 102,000 BTU/hr |
| Net AHRI Rating | 89,000 BTU/hr |
| Efficiency | 95% AFUE |
| Turndown Ratio | 10:1 |
| Water Connections | 1 inch |
| Gas Connection | 1/2 inch |
|---|---|
| Vent Options | 2-inch venting up to 100 equivalent feet, subject to installation requirements |
| Approved Vent Materials | PVC, CPVC, polypropylene or approved stainless steel |
| Electrical Supply | 120 VAC, 60 Hz, single phase |
| Approximate Dimensions | 24" H × 17-1/4" W × 18" D |
| Installation Type | Indoor wall-mounted installation |
| Heat Exchanger Warranty | 10-year limited warranty |
| Parts Warranty | 5-year limited warranty |
| ENERGY STAR® Certified | Yes |
Altitude and system-sizing assistance:
For installations above 4,500 feet, or for assistance determining whether
this boiler is properly sized for your heating system, please call
1-800-663-7831 before ordering.
Boiler selection should be based on a professional heat-loss calculation,
not square footage alone. Installation, venting, gas connections, system
piping, startup and combustion testing must be completed by a qualified
heating professional in accordance with Lochinvar instructions and all
applicable codes. Warranty coverage is subject to the manufacturer’s
current terms and conditions.
