The KNIGHT line is Lochinvar\'s earlier-generation wall-hung fire-tube combi boiler — still in current sale alongside the newer NOBLE. Key advantage over NOBLE: 10-year heat exchanger warranty vs NOBLE\'s 5-year.
The lineup
- WHN85 — 85 MBH, 3.4 GPM DHW. Smallest Knight combi; for smaller homes or replacement of cast-iron boilers
- WHN155 — 155 MBH, 4.5 GPM DHW. Volume mid-size Knight combi
- WHN199 — 199 MBH, 5.0 GPM DHW. Largest Knight combi
Why KNIGHT still exists alongside NOBLE
- 10-year heat exchanger warranty — twice as long as NOBLE\'s 5-year
- More size options — 85 MBH unit not available in NOBLE
- Proven service record — older platform with established parts availability and contractor experience
- Compatible spare-parts inventory for contractors who service older Knights
Specs
| Model | BTU | DHW GPM at 70°F rise | AFUE |
|---|---|---|---|
| WHN85 | 85,000 | 3.4 | 95% |
| WHN155 | 155,000 | 4.5 | 95% |
| WHN199 | 199,000 | 5.0 | 95% |
Features
- Stainless fire-tube heat exchanger
- 10:1 turndown modulation
- Built-in circulator
- Direct vent PVC
- Outdoor reset capable
- SMART SYSTEM control
Install
Same as NOBLE — see install guide. WHN85 may use ½" gas line if short runs; WHN155 and WHN199 typically ¾"+.
Warranty
- 10-year heat exchanger
- 1-year parts
- 1-year labor
- Annual professional service required
When to choose KNIGHT over NOBLE
- Want the longer 10-year heat exchanger warranty
- Need 85 MBH size (smallest available)
- Working with a contractor who has more Knight experience
- Replacing an existing Knight (parts/service familiarity)
Bottom line
KNIGHT is the legacy-but-current Lochinvar combi. Longer heat exchanger warranty than NOBLE, smaller available sizing options, and a proven track record. New installs splitting between NOBLE and KNIGHT — contractor preference and warranty priority drive the choice.