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NAVIEN NCB-250/150H Combi Boiler, 150,000 BTU Heating, 210,000 BTU Water Heating
The Navien NCB-250/150H, installed by 4Most Energy, delivers 150,000 BTU heating and 210,000 BTU hot water with a 10.8 GPM max flow rate. Ideal for large homes or multi-zone systems, it’s built for high-demand hot water and multiple heating applications.
$4,524.00
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Navien NCB-250/150H Combi Boiler
Installed by 4Most Energy — 150,000 BTU Heating • 210,000 BTU Hot Water
The NCB-250/150H is Navien’s high-output, high-efficiency condensing combi boiler for homes and buildings that need serious heat. It delivers powerful space heating (150,000 BTU/h) and continuous domestic hot water (210,000 BTU/h) in one compact, wall-mounted unit. Professionally installed and commissioned by 4Most Energy, it’s built for demanding Ontario winters and high-usage households.
Why homeowners choose this model (with 4Most Energy):
Up to 95% AFUE condensing efficiency to cut gas costs and emissions
Stainless-steel heat exchanger for durability and corrosion resistance
Smart, modulating burner for stable temperatures and quiet operation
Wi-Fi ready (NaviLink™) for remote monitoring and control
Direct-vent design with flexible venting options
Best fit (size & applications):
Ideal for large homes and multi-zone systems up to ~4,000 sq. ft.
Supports 3–4 bathrooms with a hot-water flow up to 10.8 GPM (site/temperature-rise dependent)
Excellent for, high-demand domestic hot water needs, high heat-loss buildings, zoned hydronic designs, in-floor radiant loops, radiators/baseboard, and hydronic air-handler setups
Installed by 4Most Energy (what’s included):
Licensed HVAC technicians, stainless-steel & black-iron piping, proper venting/condensate, start-up calibration & safety testing
1-Year Labour Warranty from 4Most Energy
Navien warranties: 10-Year Heat Exchanger + 5-Year Parts
Service coverage:
Priority installation and after-install service across Toronto, York, Peel, Halton, Durham, Hamilton, Niagara, Kitchener-Waterloo, Guelph, Cambridge, Milton, Orangeville, Barrie and nearby communities.
Additional Information
Additional Information
| Model | NCB-250/150H | Brand | Navien | Series | NCB-H |
|---|---|---|---|---|---|
| Heating Capacity | 150,000 BTU | Water Heating Capacity | 210,000 BTU | Energy Factor | 95% |
| Flow Rate (Max) | 10.8 GPM | Flow Rate (Average) | 8.5 GPM | Wi-Fi Capable | YES |
| Venting Type | Direct Vent | Built-In Recirculation | YES | Energy Star | YES |
| Product Depth | 13.2" | Product Width | 17.3" | Product Height | 28" |
| Weight | 85 lbs | Warranty on Heat Exchanger | 10 Years | Warranty on Parts | 5 Years |
| Labour Warranty (4Most Energy) | 1 Year – Professional Installation by Certified 4Most Energy Technicians | ||||
Service Area
4Most Energy proudly serves homeowners and businesses throughout the Greater Toronto Area, Golden Horseshoe, and Southwestern Ontario with professional installation and service for Navien tankless water heaters and boilers.
We offer expert sales, installation, and maintenance for all Navien high-efficiency systems in:
Toronto • North York • Richmond Hill • Vaughan • Markham • Aurora • Newmarket • Mississauga • Oakville • Burlington • Brampton • Hamilton • St. Catharines • Niagara Falls • Kitchener • Waterloo • Guelph • Cambridge • Milton • Orangeville • Barrie • Oshawa • Whitby • Ajax • Pickering • Stoney Creek • Grimsby, and all surrounding communities.
Our certified HVAC team provides on-site installation and replacement services across these regions. Every Navien installation by 4Most Energy includes a 1-year labour warranty, ensuring peace of mind and guaranteed workmanship.
With licensed technicians strategically located throughout Ontario, we offer fast response times for after-installation service, emergency repairs, and priority maintenance calls, keeping your Navien tankless water heater or boiler running efficiently year-round.
Sizing Table
System Size & Capacity
The Navien NCB-250/150H is sized for
large homes and multi-zone systems up to ~4,000 sq. ft.
with 4–5 bathrooms and high domestic hot-water demand.
Heating output: 150,000 BTU/h •
Domestic hot water: 210,000 BTU/h •
Flow rate: max 10.8 GPM (average 8.5 GPM),
depending on incoming water temperature and rise.
Ideal for multiple heating applications:
in-floor radiant loops, radiators/baseboard,
and hydronic air-handler systems in mixed or zoned designs.
Installed by 4Most Energy with expert sizing, zoning guidance,
and priority after-installation support across Ontario.
