| Bechtel Plant Machinery, Inc. | Monroeville | PA | $12.1B |
| BWXT Nuclear Operations Group, Inc.Lynchburg, VA · UEI WJYVCPD5HKK7 | Lynchburg | VA | $99.7M |
| Advanced Cooling Technologies Inc. | Lancaster | PA | $49.9M |
| Aqua-chem, Inc. | Knoxville | TN | $45.1M |
| Ametek Thermal Systems Inc. | Garden City | NY | $25.4M |
| Alfa Laval Inc.Chesapeake, VA · UEI GMK1MSRKPVA9 | Chesapeake | VA | $21.6M |
| Boyd Corporation (woburn) Inc. | Woburn | MA | $9.04M |
| Porobond Products, LLC | Hamden | CT | $7.84M |
| Fluid Handling LLC | Buffalo | NY | $7.41M |
| Alfa Laval Inc.Warrington, PA · UEI WSK3WRSGKAU1 | Warrington | PA | $5.54M |
| Ivan Ware & Son, LLC | Louisville | KY | $4.98M |
| International Mezzo Technologies, Inc. | Baton Rouge | LA | $4.71M |
| Tranter Inc. | Houston | TX | $3.2M |
| Kam Thermal Equipment, Ltd. | Bohemia | NY | $3.07M |
| Lynchburg Air Preheater Corporation | Lynchburg | VA | $2.08M |
| Industrial Heat Transfer, Inc. | Coon Valley | WI | $1.9M |
| Applied Cooling Technology, LLC | Punta Gorda | FL | $1.68M |
| Alfa Laval Inc.Henrico, VA · UEI CU8MXDBWEVE5 | Henrico | VA | $1.47M |
| Powerhouse Equipment & Engineering Co. Inc. | Delanco | NJ | $1.02M |
| Mid Mountain Boiler And Steam, Inc. | Addy | WA | $886K |
| Mayers Industries Corp. | Watchung | NJ | $798K |
| Cole Industrial Inc. | Mountlake Terrace | WA | $656K |
| Api Heat Transfer Inc. | Buffalo | NY | $576K |
| Clayton Manufacturing Company | City Of Industry | CA | $557K |
| Mahan's Thermal Products, Inc. | Covington | GA | $511K |
| R.w. Fernstrum & Company | Menominee | MI | $424K |
| Diversified Heat Transfer, Inc. | Towaco | NJ | $422K |
| Horizon Aerospace Solutions, LLC | Doral | FL | $405K |
| Quintel Inc. | Schererville | IN | $349K |
| Schutte & Koerting Acquisition Company | Feasterville Trevose | PA | $321K |
| Thermal Engineering International (usa) Inc. | La Palma | CA | $243K |
| Industrial Heat Technologies, Inc. | Tustin | CA | $239K |
| 3075109 Canada Inc. | Candiac | QC | $182K |
| Jarvis Welding, L.L.P. | Canton | IL | $154K |
| Thermal Products, Inc. | Clifton Park | NY | $142K |
| Comprex, LLC | La Crosse | WI | $116K |
| WCR Inc. | Fairborn | OH | $105K |
| Ace Heaters LLC | Corona | CA | $97.8K |
| American Exchanger Services, Inc. | Hartford | WI | $94.9K |
| Thomas C. Wilson, LLC | Long Island City | NY | $92.5K |
| Monarch Welding & Engineering Inc. | Warren | MI | $91.7K |
| Gec Zimbabwe (private) Limited | Harare | | $43.8K |
| Montana Boiler Service Inc. | Billings | MT | $41.4K |
| Industrial Boiler Inc. | Vineland | NJ | $40.1K |
| Alamo Welding & Boiler Work, Inc. | San Antonio | TX | $38K |
| Hs Marston Aerospace Limited | Wolverhampton | | $35.8K |
| Dry Coolers Inc. | Oxford | MI | $27.9K |
| Dean Boiler Inc. | Grand Rapids | MI | $26.3K |
| Siebring Manufacturing, Inc. | George | IA | $17.1K |
| Ch Murphy Clark Ullman Inc. | Portland | OR | $7,157 |
| Aero-classics Heat Transfer Products, Inc. | La Verne | CA | $0 |
| Aerotest Operations, Inc. | San Ramon | CA | $0 |
| Affton Auto Radiator And Air Conditioning Service, Inc. | Fenton | MO | $0 |
| Alabama Heat Exchangers Inc. | Theodore | AL | $0 |
| BWXT Nuclear Operations Group Inc. | Euclid | OH | Subcontractor |
| BWXT Nuclear Operations Group, Inc.Mount Vernon, IN · UEI J23YLB3F4Z45 | Mount Vernon | IN | Subcontractor |
| Cain Industries, Inc. | Germantown | WI | $0 |
| Donelson Corp. | Peoria | IL | $0 |
| Energy Steel & Supply Co. | Rochester Hills | MI | Subcontractor |
| Enerquip, LLC | Medford | WI | $0 |
| Fulton Thermal Corp. | Pulaski | NY | Subcontractor |
| Heat Exchange Applied Technology Inc. | Orrville | OH | $0 |
| Indeck Keystone Energy, LLC | Erie | PA | Subcontractor |
| J & H Boiler Services LLC | Dawsonville | GA | $0 |
| Joseph Oat Corp. | Camden | NJ | $0 |
| Kairos Power LLC | Alameda | CA | Subcontractor |
| Logan Industries International Corporation | Hempstead | TX | $0 |
| Machine Dynamics & Engineering Inc. | Minerva | OH | Subcontractor |
| Marks Brothers Inc. | Boring | OR | $0 |
| Mckenna Boiler Works, Inc. | Oceanside | CA | $0 |
| Noren Thermal Solutions LLC | Troy | TX | Subcontractor |
| Northwest Copper Works, Inc. | Portland | OR | Subcontractor |
| Rentech Boiler Systems, Inc. | Abilene | TX | Subcontractor |
| Retubeco, Inc. | Ooltewah | TN | Subcontractor |
| Specialty Machine Works Inc. | Gulfport | MS | $0 |
| Thermal Engineering International USA Inc. | Joplin | MO | Subcontractor |
| Thermally Engineered Manufactured Products, Inc. | Gardena | CA | Subcontractor |
| Triumph Thermal Systems, Inc. | Shelbyville | IN | $0 |
| Virginia Heat Transfer & Process Equipment, Inc. | Midlothian | VA | $0 |
| Vpe Thermal LLC | Sacramento | CA | Subcontractor |
| Wabtec Components LLC | Duquesne | PA | $0 |
| X Energy, LLC | Rockville | MD | Subcontractor |
