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This is a Horizontal / Upflow unit. Learn More
The GMS8/GDS8 multi-position gas furnaces features a patented aluminized steel tubular heat exchanger and high-efficiency hot surface ignition system. These furnaces are run-tested for heating or combination heating/cooling applications. With a heavy-gauge, reinforced, wrap-around insulated steel cabinet and durable baked enamel finish, these units can be installed in a utility room, closet, alcove, basement or attic. (Not intended for use in mobile homes.)

Important Safety Notice

Features
  • Corrosion-resistant, aluminized-steel tubular heat exchanger
  • Designed for multi-position installation - GMS8: upflow, horizontal right or left; GDS8: dedicated downflow
  • Energy-saving, reliable hot surface ignition system with patented adaptive learning algorithm to maximize igniter life
  • Aluminized steel inshot burners
  • Energy-saving PSC, multi-speed, direct drive blower motor
  • Quiet, corrosion-resistant induced draft blower assembly
  • Integrated furnace control with diagnostics
  • Low voltage terminal blocks
  • Multiple flame roll-out switches, blower door safety switch, outlet air-limit switch and pressure switch for proof of combustion air
  • 40VA transformer for heating and air conditioning control service
  • Combination redundant gas valve and regulator
  • A rotating combustion air blower (GMS8) that provides the option of venting the furnace through the top, right-hand side or left-hand side
  • Completely assembled, factory run-tested furnace for heating or combination heating/cooling application
  • Specific models comply with California NOx Standards
  • Heavy-gauge, reinforced, fully insulated steel cabinet with durable baked-enamel finish
  • Attractive architectural gray paint finish
  • Foil-face insulation lines the heat exchanger compartment
  • Coil and furnace fit flush for easy installation
  • Convenient left or right connection for gas and electric service
  • Bottom or side air inlet (GMS8)
  • Removable, solid-bottom block off
  • This furnace is not for sale to the state of California, due to emissions laws. Please see instead our high efficiency furnaces (models GMS90, GCS90, GMV90, GCV90) which are compliant with California laws.

Configuration

Configuration is the direction the conditioned air will pass through the unit.

Upflow units will have the air come in from the bottom and blow out the top.

Horizontal units will have the air go through the unit left to right, or right to left.

Downflow units will have the air come in from the top of the unit, and blow out the bottom.

Unsure of what configuration your home needs? Call us at 800-865-5931. Monday through Friday, 8:30am to 5:00pm CST

Configuration
Upflow / Horizontal
Blower Cooling Capacity

The tonnage of air conditioning that can be moved effectively by the blower. You want to make sure that the blower is appropriately sized for the air conditioner. If it is too small the coil could ice up. If it is too large than the air coming out of the ducts won't be cold enough.

Blower Cooling Capacity
3 Tons
Maximum Input BTU

The maximum amount of heat that the unit can produce. The amount delivered into the space will be the input minus the efficiency loss also know as the output. For example a 100000 btu furnace at 80% efficiency will give you 80000 out btus of heat. The same size furnace at 95% will give you 95000 btus of heat.

Maximum Input BTU
90,000 BTU
Maximum Heating Output BTU

The amount of heat, rated in British Thermal Units (BTUs), that the unit can deliver into the space. Not sure how many BTUs you need? Try our easy Equipment Sizing Estimator.

Maximum Heating Output BTU
72,000 BTU
Efficiency (% AFUE)

The percentage of energy converted into output by the unit. The remaining percentage is lost during the conversion process. The higher the efficiency, the lower the operational cost.

Efficiency (% AFUE)
80 %
Burner Stages

A single stage furnace has one heat setting. The furnace is either on at full capacity or it is off.

A two stage furnace has two different heat settings; one full capacity and a second lower heat setting. The advantage of a two stage furnace is that it extends the run time which does a better job distributing the air in your home. This helps improve your homes comfort level while reducing drafty areas.

A modulating furnace will heat on a low capacity until a call for high heat is sent to the furnace. Once a high heat call is initiated the furnace will slowly increase the burner level and blower speed over time, until reaching full capacity. The advantages are potentially reduced noise and better efficiency in some models. A modulating furnace should provide the best comfort level.

Burner Stages
Single
Maximum Overcurrent Protection (Breaker)

The maximum capacity breaker in the building's circuit panel that can be used on the dedicated electrical line supplying the equipment.

Maximum Overcurrent Protection (Breaker)
15 Amps
Product Weight
153 lbs
Width
17 1/2 Inches
Depth
28 Inches
Height
39 Inches
Heat Exchanger Warranty
Lifetime
Parts Warranty
5 Years

In 2002 Alpine Home Air Products became the first company to sell heating, air conditioning and indoor air-quality products online. We have proudly served hundreds of thousands of customers, helping them save time and money by buying their products direct.