Navien NFB-399CvsTHERMAL SOLUTIONS AMP400
Side-by-side commercial boiler comparison
Navien NFB-399C
Thermal Efficiency
97.5%
Input Rate
399MBTU/hr
Turndown Ratio
15.00
Application
Indoor
THERMAL SOLUTIONS AMP400
Thermal Efficiency
97%
Input Rate
400MBTU/hr
Turndown Ratio
10.00
Application
Indoor
Key differences
Both models are closely matched on thermal eff: 97.5 vs 97.0 %. The THERMAL SOLUTIONS AMP400 is larger at 400 MBTU/hr versus 399 MBTU/hr. Overall, the Navien NFB-399C sits higher in the category, ranking above 84% of certified commercial boilers.
Performance
| Spec | Navien | THERMAL SOLUTIONS |
|---|---|---|
| Thermal Efficiency(%) | 97.5 | 97 |
| Full-Load Input Rate(MBTU/hr) | 399 | 400 |
| Turndown Ratio | 15.00 | 10.00 |
Configuration
| Spec | Navien | THERMAL SOLUTIONS |
|---|---|---|
| Application | Indoor | Indoor |
| Control Type | Multi-stage | Multi-stage |
| Model Name | NFB-399C | AMP |