| Business | Phone |
| Advanced Boiler & Combustion 1415 Linden Ave, Knoxville 37917 | (865) 546-5735 |
| Boiler Equipment Co 1443 N 6th Ave, Knoxville 37917 | (865) 525-0771 |
| Tennessee Boiler Repair 1739 Callahan Dr, Knoxville 37912 | (865) 947-2065 |
| Precision Boiler Repair 8431 Maynardville Pike, Knoxville 37938 | (865) 922-9813 |