| Business | Phone |
| Boiler Tech Inc 7030 Huntley Rd # C, Columbus 43229 | (614) 888-2404 |
| Gurina Co 1379 River St, Columbus 43222 | (614) 279-3891 |
| Max's Boiler Burner & Control 181 Tibet Rd, Columbus 43202 | (614) 261-6613 |
| Franklin Heating & Ref., Inc. PO Box 32362, Columbus 43232 | (614) 836-9119 |
| Franklin Heating & Ref., Inc. PO Box 32362, Columbus 43232 | (614) 836-9119 |