| AFUE | : | 84 % |
| BTU Heating Input Rating (Custom) | : | 168,000 BTU/h |
| BTU Heating Input Rating | : | 166,000 BTU/h |
| BTU Heating Output Rating (Custom) | : | 120,000 BTU/h |
| BTU Heating Output Rating | : | 122,000 BTU/h |
| Condensing | : | No |
| Depth | : | 23.25 in |
| Fuel Type | : | Natural Gas |
| Gas Connection Size | : | 1/2 in |
| Height | : | 60.375 in |
| Ignition Type | : | Intermittent Pilot |
| Inlet Connection Size | : | 1-1/4 in |
| Installation / Mounting Type | : | Floor Mount |
| Media / Fluid Type | : | Water |
| Model Number | : | GWA |
| Number of Stages | : | Single-Stage |
| Outlet Connection Size | : | 1-1/4 in |
| Phase | : | 1 ph |
| Product Family | : | GWA Series |
| Vent Type | : | Atmospheric |
| Voltage Rating | : | 120 V |
| Width | : | 19 in |
- gwa-series-3-boiler-manual-23627
- gwa-series-3-brochure-23626
- gwa-series-3-use-and-care-manual-23628
- residential-warranty-manufactured-on-or-after-5-2-16-23630
- williamsonthermoflo-specification-sheet-24876
- gwa-series-3-brochure-23626
- gwa-series-3-boiler-manual-23627
- williamsonthermoflo-specification-sheet-24876
- gwa-series-3-use-and-care-manual-23628
- residential-warranty-manufactured-on-or-after-5-2-16-23630