Weatherking W802W1005A21UHSBAS Gas Furnace 100K Btu 80%

Product Description

The WEATHERKING W802W1005A21UHSBAS is an 80 percent AFUE natural gas furnace designed for upflow and horizontal installations in residential and light-commercial forced-air heating systems. Rated at 100,000 BTU/h, it uses a two-stage burner and an ECM variable-speed blower motor to match heat output to demand, reducing temperature swings and improving system efficiency. The combination of two-stage firing and variable-speed airflow also lowers operating noise compared to single-stage, fixed-speed designs. Licensed HVAC technicians handle installation and commissioning of this unit.

This furnace is built for upflow or horizontal configurations, making it suitable for installations in utility closets, basements, attics, and platform applications where horizontal venting is required. The 21-inch cabinet width fits standard furnace openings in many residential builds. At 5 nominal tons of matched airflow capacity, it pairs with up to 5-ton cooling coils for year-round forced-air system use. Typical applications include new construction and retrofit projects in residential single-family and light-commercial spaces requiring an 80 percent non-condensing gas furnace.

Key Features

• 80 percent AFUE efficiency rating — non-condensing design compatible with B-vent or direct-vent flue systems
• 100,000 BTU/h input capacity suitable for larger residential or light-commercial spaces
• Two-stage burner reduces short-cycling and improves temperature consistency
• ECM variable-speed blower motor lowers electrical consumption and operating sound levels
• Upflow and horizontal configuration supports multiple installation orientations
• 21-inch cabinet width fits standard furnace platform and closet openings

Compatibility

Designed as an OEM-style upflow and horizontal natural gas furnace for forced-air residential and light-commercial heating systems requiring an 80 percent AFUE, 100,000 BTU/h, two-stage ECM unit in a 21-inch cabinet.

Installation Notes

Installation must be performed by a licensed HVAC technician in accordance with the National Fuel Gas Code (NFPA 54 / ANSI Z223.1), local mechanical codes, and the manufacturer installation instructions. Shut off gas supply and disconnect electrical power before any service or wiring work. Flue venting must be sized and routed per the appliance category and local code requirements. Do not operate the unit without verifying proper gas supply pressure, flue integrity, and low-voltage control wiring connections.

Technical Specifications

• Fuel Type: Natural Gas
• Input Capacity: 100,000 BTU/h
• AFUE Efficiency: 80 percent
• Staging: Two Stage
• Motor Type: ECM Variable Speed
• Configuration: Upflow / Horizontal
• Nominal Tons: 5 tons
• Cabinet Width: 21 inches

Standard Information

• Brand: WEATHERKING
• Manufacturer Part Number: W802W1005A21UHSBAS