| AFUE Rating | : | 91.9 % |
| BTU Rating | : | 70000 Btu/hr |
| Capacity | : | 3.8 gal |
| Chimney/Breeching/Vent Size | : | 3 in Vent Dia |
| Connection Type | : | 1 in NPT Supply/Return |
| Dimensions | : | 30-3/4 in H x 24-5/8 in W x 30-3/4 in D |
| Fuel Type | : | Natural Gas |
| Material | : | Cast-Iron |
| Model | : | GWC-070 |
| Net BTU Rating | : | 57000 Btu/hr |
| Series | : | GWC Series |
| Vent Type | : | Direct Exhaust |
Williamson Gas Fired Water Boiler, GWC Series, Model: GWC-070, 91.9 % AFUE, 70000 Btu/hr BTU, 3.8 gal Capacity, 1 in NPT Supply/Return Connection, Natural Gas Fuel, Direct Exhaust Vent, Chimney/Breeching/Vent Size: 3 in Vent Dia, Net BTU Rating: 57000 Btu/hr, Cast-Iron, Dimensions: 30-3/4 in H x 24-5/8 in W x 30-3/4 in D
- Factory tested
- PVC or stainless steel venting
- Sealed combustion or direct exhaust venting
- Multiple pass heat exchanger
- Cast iron primary heat exchanger
- Stainless steel secondary heat exchanger with air separator
- Control module with indicator lights
- Interred heat program providing automatic adjustment of boiler water temperature to match demand
- Hot surface ignition system
- Insulated heavy gauge steel jacket
- Blower assembly with observation port
- Electrical junction box
- 30 lb/sq-in ASME relief valve
- Built-in bypass circulator system with sensor for temperature control
- Negative regulation gas valve
- Gas/air orifice plate for natural gas, separate plate provided with unit for conversion to propane
- Water treatment - inhibitor and test kit
- 1/2 in gas connection size, 1 in minimum pipe size
- 20 years cast iron heat exchanger warranty, five-years stainless steel heat exchanger warranty, two-years parts warranty for residential purpose
- Intermittent pilot