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Williamson-Thermoflo GWA-070-NS Standing Pilot Gas Cast Iron Boiler 80.1% - 70,000 BTU
Model:
GWA-070-NS-Natural
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Recommended Accessories
Expert Recommended Accessories
Selected by Ken, our Expert
Required Accessories
9
These accessories are required to properly setup/install this product.
Optional Accessories
10
Features
- One-piece access door.
- Insulated Extended Steel Jacket.
- Cast Iron Section s w ith Built-in Air Separator.
- Circulator & Near Boiler Piping.
- Pressure Temperature Gauge.
- Safety Relief Valve.
- Drain Valve.
- High Limit.
- Circulator Pump Relay.
- Transformer and Junction Box.
- Automatic Vent Damper.
- 120V Power switch
- 100% Shut-off Combination.
- Non-Linting Pilot Burner.
- Stainless Steel Burners.
- Vertical Drafthood
- Blocked Vent Limit Switch.
- Flame Roll-Out Switch
- Factory tested.
The Williamson-Thermoflo GWA series boiler are chimney vented and can used with natural or propane gas. They are designed to be used with all kind of radiators and radiant floor heating systems. Thanks to the durable cast iron sections the GWA series boilers are proven to last for decades. The GWA series boilers are made for most residential applications and with sizes from 52,000-245,000 BTUs we have the right unit for you.
To design and build the best comfort heating products on the market. To make them first. And to make them last...for decades.
Features and Benefits of the Williamson GWA Cast Iron Boiler
Traditional Cast Iron Sections.
Compact Design: Saves valuable living space.
Stainless Steel Burners: Burners provide fixed primary air-no air adjustment required. Provide quieter ignition, longer life, and improved combustion.
Honeywell controls. High quality brand name controls assure reliability and availability.
Wiring Harness: Plug-in connectors that attach only one way to assure mistake-proof wiring for installation and component replacement.
Convenient Servicing: Accessible controls--control module with diagnostic indicator lights--simplified wiring--vertical flueways--top cleaning.
Cast Iron Sections with Push Nipples: Boiler sections are made of durable cast iron for strength, efficiency and long life. Modern elastomer sealing rings in the port openings assure a permanent watertight seal.
Automatic Vent Damper: Prevents heat from escaping up the chimney when the burners are not operating. Saves fuel. Standard equipment on NS and NI models.
Made in the USA.
Other Standard Features :
Product Warranty
1 year parts / Limited lifetime heat exchanger
Specifications
GWA-070-NS-Natural
Performance
Maximum Input Capacity
Maximum Input Capacity
The Maximum Input Capacity describes how quickly the appliance will use fuel when delivering it's maximum capacity. The units may change depending on the fuel being used.
70000 BTU
DOE Heating Capacity
DOE Heating Capacity
Also referred to as Gross Output, this is the output of a boiler after accounting for combustion efficiency. We recommend sizing hot water boilers based on the DOE Heating Capacity.
56400 BTU
Net I=B=R Capacity
Net I=B=R Capacity
I=B=R, also referred to as Net Output or AHRI Capacity, is the rated heat output of a boiler after accounting for combustion efficiency, piping loss, and an extra pickup factor. We recommend sizing steam boilers based on the I=B=R rating.
50000 BTU
Efficiency
80.1 %
Warranty Information
Parts Warranty
Parts Warranty
A warranty is a safeguard from defects in manufacturing and can vary in length and terms. Some manufacturers require registration for extended warranty benefits, be sure to check out features and the warranty document. To see the manufacturer's warranty statement, click on the Manuals tab. Learn More
1 Year
Heat Exchanger Warranty
Lifetime Years
General Information
Medium
Medium
Medium refers to the substance that carries heat through the heating system. Systems are either designed to use either Hot Water or Steam as a medium, and components are usually specific to one or the other.
Hot Water
Fuel Type
Fuel Type
To create heat, some form of fuel is required. Fuel Type specifies what the product uses as an input to create heat.
Natural Gas
Combustion Type
Combustion Type
Condensing appliances use leftover thermal energy from combustion gases to heat water in a secondary heat exchanger, resulting in higher efficiency and lower exhaust temperature.
Conventional
Vent Type
Vent Type
Products that use combustion (burning) of fuel to create heat also create potentially dangerous gasses that need to be exhausted (AKA "Vented"). Depending on the product, venting can be done via a chimney, through a side wall, or use a second vent to provide fresh air to the appliance.
Chimney Vent
DHW Production
DHW Production
DHW (Domestic Hot Water) is potable water for uses other than space heat. Some boilers are able to provide DHW "out of the box", while others can do so with the purchase of optional accessories.
Yes
Modulating/Staging
Modulating/Staging
Stages are unique speeds or levels that equipment can operate at. More stages allow for better fine-tuned control of output, which improves comfort and efficiency. Modulating equipment can operate across a range of levels, giving the highest level of fine-tuned control. Learn More
Staging
Mount Type
Floor
Minimum Altitude
0 Feet
Maximum Altitude
2000 Feet
Includes Pump
Yes
Assembly Type
Packaged
Electrical Data
Voltage
115 Volts
Phase
1
Frequency
60 Hz
Dimensions
Supply Connection
1 1/4 Inches
Return Connection
1 1/4 Inches
Product Height
52 3/8 Inches
Product Width
10 Inches
Product Depth
23 1/4 Inches
Product Weight
200 Pounds
Reviews
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Williamson-Thermoflo GWA-070-NS Standing Pilot Gas Cast Iron Boiler 80.1% - 70,000 BTU
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