Oil Boiler Manuals — page 4
Oil models
| Model | Brand | Description | Certified |
|---|---|---|---|
| OWB-6-T-S3-D | Williamson-Thermoflo | 87% AFUE non-condensing oil-fired boiler | September 2026 |
| OWT-3-T-S3-D | Williamson-Thermoflo | 87% AFUE non-condensing oil-fired boiler | September 2026 |
| OWT-4-T-S3-D | Williamson-Thermoflo | 87% AFUE non-condensing oil-fired boiler | September 2026 |
| OWT-5-T-S3-D | Williamson-Thermoflo | 87% AFUE non-condensing oil-fired boiler | September 2026 |
| OWT-6-T-S3-D | Williamson-Thermoflo | 87% AFUE non-condensing oil-fired boiler | September 2026 |