Weatherking W802W1005A21DZSBAS Gas Furnace 100K Btu

Product Description

The WEATHERKING W802W1005A21DZSBAS is a downflow natural gas furnace rated at 100,000 BTU/h with 80% AFUE efficiency. It uses a two-stage gas valve paired with an ECM variable speed blower motor to deliver consistent heat output while reducing energy consumption compared to single-stage, fixed-speed designs. The two-stage operation allows the furnace to run at a lower capacity during moderate demand, then ramp to full output during peak heating loads. This unit is installed by licensed HVAC technicians in residential applications where a downflow configuration is required. The 21-inch cabinet width suits standard platform or closet installations where downflow airflow is necessary.

This furnace is configured for downflow air delivery, meaning supply air exits through the bottom of the unit and return air enters from the top. That configuration is typical in installations where ductwork runs beneath a platform or slab, such as closet-mounted systems above a crawlspace or raised floor. Rated at 5 nominal tons of airflow capacity, the W802W1005A21DZSBAS is suited for larger residential applications. The ECM variable speed motor supports improved humidity control and quieter operation across both heating and cooling modes when matched with a compatible cooling system.

Key Features

• 100,000 BTU/h heating capacity with 80% AFUE efficiency rating
• Two-stage gas valve reduces short cycling and improves temperature consistency
• ECM variable speed blower motor lowers electrical consumption versus PSC motors
• Downflow configuration with 21-inch cabinet width for platform or closet installs
• 5 nominal tons of airflow capacity for larger residential systems
• Natural gas fuel type for compatibility with standard residential gas supply

Compatibility

Designed as an OEM-style downflow gas furnace replacement or new installation unit for residential natural gas heating systems requiring an 80% AFUE, two-stage, ECM variable speed, downflow configuration in a 21-inch cabinet.

Installation Notes

Installation must be performed by a licensed HVAC technician in accordance with local mechanical codes and the manufacturer instructions. Shut off gas supply and disconnect electrical power before beginning any work on the unit or existing ductwork. Downflow furnaces require a listed combustible-floor base when installed directly on a combustible surface. All gas connections, venting, and electrical wiring must comply with IFGC and NEC requirements as adopted by the local authority having jurisdiction.

Technical Specifications

• Fuel Type: Natural Gas
• Heating Capacity: 100,000 BTU/h
• AFUE Efficiency: 80%
• Stages: Two Stage
• Motor Type: ECM Variable Speed
• Configuration: Downflow
• Nominal Tonnage: 5 tons
• Cabinet Width: 21 inches

Standard Information

• Brand: WEATHERKING
• Manufacturer Part Number: W802W1005A21DZSBAS