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Lochinvar Noble NKC110N High-Efficiency Combi Boiler
The Lochinvar Noble NKC110N is a high-efficiency, wall-mounted condensing combi boiler designed to provide hydronic space heating and domestic hot water from one compact appliance. With a maximum input of 110,000 BTU and 95% AFUE efficiency, it delivers dependable residential comfort 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
Space heating and domestic hot water:
The NKC110N is a combi boiler that provides hot water for a hydronic
space-heating system while also producing domestic hot water. Combining
both functions in one wall-mounted appliance can reduce the need for a
separate conventional water heater and simplify the mechanical-room
layout.
Key Features
- 110,000 BTU maximum input for residential heating applications
- 11,000 BTU minimum input for efficient low-load operation
- 95% AFUE high-efficiency condensing performance
- 10:1 modulation turndown ratio for improved comfort
- Provides hydronic space heating and domestic hot water
- Up to 2.6 GPM domestic hot water at a 77°F temperature rise
- Durable ASME stainless steel fire-tube heat exchanger
- Low pressure-drop design provides greater piping flexibility
- SMART CONTROL™ digital operating system
- Outdoor-reset control capability
- Universal vent adapter supports several approved vent materials
- Compact wall-mounted configuration saves floor space
Ideal Applications
Radiant Floor Heating
Provides controlled hot-water temperatures for comfortable and
efficient in-floor radiant heating systems.
Domestic Hot Water
Produces household hot water and hydronic space heating from one
compact combi appliance.
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 NKC110N 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 NKC110N can provide heat for multiple rooms or heating zones while also supplying domestic hot water from the same appliance.
Technical Specifications
| Manufacturer | Lochinvar |
|---|---|
| Model | NKC110N |
| Product Type | Wall-mounted condensing fire-tube combi boiler |
| Application | Hydronic space heating and domestic hot water |
| Fuel Type | Natural gas |
| Maximum Input | 110,000 BTU/hr |
| Minimum Input | 11,000 BTU/hr |
| DOE Heating Capacity | 102,000 BTU/hr |
| Efficiency | 95% AFUE |
| Turndown Ratio | 10:1 |
| Domestic Hot Water | Up to 2.6 GPM at a 77°F temperature rise |
|---|---|
| Space-Heating Connection | 1 inch |
| Domestic Water Connection | 3/4 inch |
| Vent Connection | 3 inches |
| Approved Vent Materials | PVC, CPVC, polypropylene or approved stainless steel |
| Electrical Supply | 120 VAC, 60 Hz, single phase |
| 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 combi boiler is properly sized for your heating and domestic hot-water
requirements, please call
1-800-663-7831 before ordering.
Boiler selection should be based on a professional heat-loss calculation
and domestic hot-water demand, 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.
