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Lochinvar Noble NKC150N High-Efficiency Combi Boiler
The Lochinvar Noble NKC150N is a high-efficiency, wall-mounted condensing combi boiler that provides hydronic space heating and domestic hot water from one compact appliance. With a maximum input of 150,000 BTU and 95% AFUE efficiency, it provides dependable comfort while helping reduce natural gas consumption.
The NKC150N combines an ASME stainless steel fire-tube heat exchanger for space heating with a stainless steel brazed-plate heat exchanger for domestic hot-water production. Its compact wall-mounted design reduces the amount of mechanical-room equipment needed while preserving valuable floor space.
150,000
Maximum BTU Input
95%
AFUE Efficiency
3.6 GPM
Domestic Hot Water
All-in-one combi boiler:
The NKC150N provides both hydronic space heating and on-demand domestic
hot water. Its 3.6 GPM domestic hot-water rating is based on a 77°F
temperature rise. Actual hot-water delivery will vary depending on
incoming water temperature, set point and simultaneous fixture demand.
Key Features
- 150,000 BTU maximum input for residential heating applications
- 15,000 BTU minimum input for efficient low-load operation
- 95% AFUE high-efficiency condensing performance
- 10:1 modulation turndown ratio for improved comfort
- Provides space heating and domestic hot water from one appliance
- Up to 3.6 GPM domestic hot water at a 77°F temperature rise
- ASME stainless steel fire-tube heat exchanger
- Stainless steel brazed-plate domestic water heat exchanger
- SMART CONTROL™ digital operating system
- Plain-language LCD display and guided setup controls
- Outdoor-reset control capability
- Domestic hot-water preheat and response settings
- Air-handler interlock for compatible hydro-air systems
- Built-in circulating pump
- Universal vent connection for multiple vent materials
- ENERGY STAR® certified residential boiler
Ideal Applications
Radiant Floor Heating
Provides controlled hot-water temperatures for comfortable and
efficient in-floor radiant heating systems.
Domestic Hot Water
Produces on-demand hot water for showers, sinks and other residential
plumbing fixtures without a separate tank-style water heater.
Baseboard and Radiator Heating
Can supply properly designed hydronic baseboard, panel-radiator and
traditional radiator systems.
Hydro-Air Systems
Can serve compatible air handlers while its interlock helps prevent
cool-air circulation during domestic hot-water production.
Heating and Hot Water From One Appliance
The Noble NKC150N is designed for homes that need efficient hydronic heating and reliable on-demand domestic hot water without installing two separate appliances.
Consistent Space Heating
The modulating burner adjusts its output as heating demand changes,
helping maintain comfortable system-water temperatures while reducing
unnecessary on-and-off cycling.
Responsive Hot Water
Advanced domestic hot-water controls provide quick response when a
faucet or shower is opened and are designed to reduce interruptions
in hot-water delivery.
Designed for Radiant Floor Heating
The NKC150N is well suited for hydronic radiant-floor heating systems. Its condensing operation, outdoor-reset capability and 10:1 turndown ratio allow the boiler to adjust as outdoor temperatures and heating loads change.
When paired with properly sized manifolds, pumps, controls and zoning components, the NKC150N can supply multiple rooms or heating zones while also producing domestic hot water from the same wall-mounted appliance.
Technical Specifications
| Manufacturer | Lochinvar |
|---|---|
| Model | NKC150N |
| Product Type | Wall-mounted condensing combi boiler |
| Fuel Type | Natural gas |
| Maximum Input | 150,000 BTU/hr |
| Minimum Input | 15,000 BTU/hr |
| DOE Heating Capacity | 139,000 BTU/hr |
| Net AHRI Rating | 121,000 BTU/hr |
| Efficiency | 95% AFUE |
| Turndown Ratio | 10:1 |
| Domestic Hot Water | Up to 3.6 GPM at a 77°F temperature rise |
| Space-Heating Connections | 1 inch |
|---|---|
| Domestic Water Connections | 3/4 inch |
| Gas Connection | 1/2 inch |
| Venting Options | 2-inch venting up to 50 equivalent feet or 3-inch venting up to 100 equivalent feet |
| Approved Vent Materials | PVC, CPVC, polypropylene or approved stainless steel |
| Electrical Supply | 120 VAC, 60 Hz, single phase |
| Dimensions | 32-1/2" H × 18-3/4" W × 18" D |
| Shipping Weight | Approximately 142 lb. |
| Heat Exchanger Warranty | 10-year limited warranty |
| Parts Warranty | 5-year limited warranty |
| Installation | Indoor installation only |
Altitude and system-sizing assistance:
This model is rated for installation at altitudes up to 4,500 feet.
For high-altitude applications or assistance determining whether this
boiler can meet 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 analysis, not square footage alone.
Installation, venting, gas connections, water 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.
