| AFUE Rating | : | 94.4 % |
| BTU Rating | : | 155 MBtu/hr |
| Capacity | : | 0.65 gal |
| Chimney/Breeching/Vent Size | : | 3 in |
| Connection Type | : | 3/4 in NPT Supply/Return |
| Dimensions | : | 27.56 in H x 16.54 in W |
| Fuel Type | : | Natural Gas |
| Ignition Type | : | Spark |
| Model | : | FS-155 |
| Mounting Type | : | Wall |
| Net BTU Rating | : | 124000 Btu/hr |
| Vent Type | : | Direct Exhaust |
Williamson FreeStyle Gas Fired Boiler, Model: FS-155, 94.4 % AFUE, 155 MBtu/hr BTU, 0.65 gal Capacity, 3/4 in NPT Supply/Return Connection, Natural Gas Fuel, Direct Exhaust Vent, Chimney/Breeching/Vent Size: 3 in, Spark Ignition, Net BTU Rating: 124000 Btu/hr, Wall Mounting, Dimensions: 27.56 in H x 16.54 in W
- Factory tested
- 10 - 1 turndown ratio, modulating combustion
- 1-tube, large diameter, ASME stainless steel heat exchanger
- Honeywell digital display control
- Sentinel X100 inhibitor and water test kit
- 24 VAC thermostat relay
- Quiet operation
- 3-in-1 vent adapter
- Removable side panels
- 3-prong power cord