Lochinvar Knight WHN
Model Number: WHN
Commercial-grade condensing boiler bringing industrial reliability to luxury homes.
Technical Specifications
Prices depend on sizing, venting and piping in your home, so we quote every installation.
Sizing: the right size comes from a room-by-room heat-loss calculation, not the size of the old boiler or a rule of thumb. Oversized boilers short-cycle and waste fuel; steam systems are sized to the connected radiation instead. See how we approach boiler installation.
Home-Specific Operating Cost Review
No guaranteed annual savings or payback period
Historical Use
Fuel consumption and weather
Current Rates
Utility and delivered-fuel prices
System Design
Load, piping, controls, and temperatures
Full Specifications
- Model Number
- WHN
- Efficiency (AFUE)
- 96%
- Boiler Type
- Condensing Boiler
- BTU Input Range
- 55k - 399k BTU
- In Production
- Yes
- Parts Warranty
- 5 years
- Heat Exchanger Warranty
- 15 years
Specification source not yet linked — figures are being verified against manufacturer data.
Ideal For
Large estates in Old Westbury and Brookville over 5,000 sq ft
Expert Review: Lochinvar Knight WHN
The Lochinvar Knight WHN brings commercial-grade performance to luxury Long Island residences. With 96% AFUE efficiency and output up to 399,000 BTU, this fire-tube condensing boiler is designed for estates exceeding 5,000 square feet in Old Westbury, Brookville, and Lattingtown. The SMART SYSTEM Plus controls provide the most sophisticated diagnostics in the industry.
Made in Tennessee, the Knight represents American manufacturing at its finest. The 10:1 turndown ratio ensures efficient operation even at partial loads—critical for maintaining comfort in large homes with multiple zones.
Commercial heritage shows in every detail—from the stainless steel fire-tube heat exchanger to the comprehensive diagnostic capabilities. Service technicians appreciate the clear error codes and accessible components.
The 15-year heat exchanger warranty provides exceptional long-term coverage for the premium investment.
Our recommendation: The Knight WHN is the ultimate choice for estate homes where budget is secondary to performance. The commercial-grade construction and advanced controls justify the premium pricing for homeowners who demand the best.
Key Features & Technology
Fire-tube heat exchanger
SMART SYSTEM Plus controls
10:1 turndown ratio
Stainless steel construction
Made in Tennessee USA
Advantages
- Commercial-grade residential performance
- Best controls in the industry
- Perfect for large estates
- Excellent diagnostics
Considerations
- Premium pricing
- Overkill for smaller homes
- Limited local distributor presence
Sizing & Installation Notes
Condensing boilers like the Knight WHN reach their rated efficiency only when return water runs cool enough to condense flue gases. We check your radiation and design water temperatures so the unit actually condenses in your home, not just on the spec sheet.
Every Lochinvar installation starts with a free in-home assessment covering the heat-loss calculation, venting and chimney condition, gas or oil supply sizing, and permit requirements for your town. Learn more about our boiler installation process, or see current rebate and incentive programs that may apply.
Warranty & Protection
Parts Warranty
5 years
Heat Exchanger
15 years
Our Guarantee
100% Satisfaction
All Lochinvar boiler installations by Home+ Air & Heat include our 1-year workmanship warranty, covering labor and any installation-related issues.
Compare the Lochinvar Lineup
| Model | Efficiency | BTU Range | Fuel | Heat Exchanger Warranty |
|---|---|---|---|---|
| Knight WHN (this model) | 96% AFUE | 55k - 399k BTU | — | 15 years |
| Noble NKC | 95% AFUE | 55k - 285k BTU | — | 15 years |
| Crest | 95% AFUE | 55k - 199k BTU | — | 10 years |
| Knight XL | 96.2% AFUE | 80k - 800k BTU | natural gas/propane | 12-year limited heat exchanger |
| Knight Fire Tube | 95% AFUE | 11k - 285k BTU | natural gas/propane | 12-year limited heat exchanger |
| Noble Combi | 95% AFUE | 16k - 199k BTU | natural gas/propane | 12-year limited heat exchanger |
See the full Lochinvar brand page for lineup context, or browse the Best Condensing Boilers guide to compare across brands.
Frequently Asked Questions
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