| ENERGY STAR Partner |
| U.S. Boiler Company, LLC |
Thermal Solutions Products LLC |
| Brand Name |
| Burnham by U.S. Boiler |
Burnham by U.S. Boiler |
| Model Name |
| Alpine |
Citadel |
| Model Number |
| ALP399C |
CTD400 |
| Full Load Input Rate (kBtu/hr) |
| 399 |
399 |
| Thermal Efficiency (%) |
| 94 |
97 |
| Turndown Ratio |
| 5 |
9 |
| Control Type |
| Multi-stage |
Multi-stage |
| Application |
| Indoor |
Indoor |
| Date Available On Market |
| November 1, 2017 |
April 24, 2023 |
| Date Qualified |
| November 8, 2021 |
February 22, 2024 |
| Markets |
| United States, Canada |
United States, Canada |
| CB Model Identifier |
| ES_23449_ALP399C_03162020181510_814871 |
ES_23449_CTD400_05112023171727_3118858 |
| Product Category |
| Commercial Boilers |
Commercial Boilers |
| Type |
| Commercial Boilers |
Commercial Boilers |
| Date Certified |
| November 8, 2021 |
February 22, 2024 |
| Meets ENERGY STAR Most Efficient 2024 Criteria |
| No |
No |
