| ULTRA-80ULTRA |
Weil-McLain |
93% AFUE condensing gas boiler |
March 2024 |
| UO-3EUltra Oil |
Weil-McLain |
87% AFUE non-condensing oil-fired boiler |
November 2021 |
| UO-3REUltra Oil |
Weil-McLain |
87% AFUE non-condensing oil-fired boiler |
November 2021 |
| UO-4EUltra Oil |
Weil-McLain |
87% AFUE non-condensing oil-fired boiler |
November 2021 |
| UO-5EUltra Oil |
Weil-McLain |
87% AFUE non-condensing oil-fired boiler |
November 2021 |
| WGO-2RDWGO |
Weil-McLain |
87% AFUE non-condensing oil-fired boiler |
November 2021 |
| WGO-3RDWGO |
Weil-McLain |
87% AFUE non-condensing oil-fired boiler |
November 2021 |
| WGO-4RDWGO |
Weil-McLain |
87% AFUE non-condensing oil-fired boiler |
November 2021 |
| WGO-5RDWGO |
Weil-McLain |
87% AFUE non-condensing oil-fired boiler |
November 2021 |
| WGO-6RDWGO |
Weil-McLain |
87% AFUE non-condensing oil-fired boiler |
November 2021 |
| WGO-7RDWGO |
Weil-McLain |
87% AFUE non-condensing oil-fired boiler |
November 2021 |
| WTGO-3RDWTGO |
Weil-McLain |
87% AFUE non-condensing oil-fired boiler |
November 2021 |
| WTGO-4RDWTGO |
Weil-McLain |
87% AFUE non-condensing oil-fired boiler |
November 2021 |
| WTGO-5RDWTGO |
Weil-McLain |
87% AFUE non-condensing oil-fired boiler |
November 2021 |
| WTGO-6RDWTGO |
Weil-McLain |
87% AFUE non-condensing oil-fired boiler |
November 2021 |
| WTGO-7RDWTGO |
Weil-McLain |
87% AFUE non-condensing oil-fired boiler |
November 2021 |
| FS-120- |
Williamson-Thermoflo |
95% AFUE condensing gas boiler |
January 2025 |
| FS-155- |
Williamson-Thermoflo |
95% AFUE condensing gas boiler |
January 2025 |
| FS-80- |
Williamson-Thermoflo |
95% AFUE condensing gas boiler |
January 2025 |
| GWC-070-N-TGWC |
Williamson-Thermoflo |
91% AFUE condensing gas boiler |
September 2026 |
| GWC-105-N-TGWC |
Williamson-Thermoflo |
91% AFUE condensing gas boiler |
September 2026 |
| GWC-140-N-TGWC |
Williamson-Thermoflo |
91% AFUE condensing gas boiler |
September 2026 |
| GWC-175-N-TGWC |
Williamson-Thermoflo |
91% AFUE condensing gas boiler |
November 2021 |
| OWB-3-T-S3-D |
Williamson-Thermoflo |
87% AFUE non-condensing oil-fired boiler |
September 2026 |
| OWB-4-T-S3-D |
Williamson-Thermoflo |
87% AFUE non-condensing oil-fired boiler |
September 2026 |
| OWB-5-T-S3-D |
Williamson-Thermoflo |
87% AFUE non-condensing oil-fired boiler |
September 2026 |
| 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 |