Gas Furnaces





G61 Internal High Efficiency Gas Furnace

The G61 is a high-efficiency gas furnace offering an impressive 5.3 star efficiency rating.

The G61 uses a variable speed motor that reduces electrical usage by 66%, compared to a standard motor. Plus, two stages of heating minimises temperature fluctuations, so you can save on energy bills without sacrificing comfort.


Key Features

  • Quiet Operation
    Fully insulated cabinet reduces noise and ensures quiet, efficient operation.

  • Two-stage, Variable Speed Operation
    Runs at low speed 80% of the time, which minimises the up-and-down temperature changes associated with standard furnaces.  This ensures a quiet and consistent flow of air whilst maintaining an ideal balance of temperature and humidity in your home.

  • Enhanced Humidity Control
    Runs at variable speeds to precisely regulate the flow of heated and cooled air throughout your home.

  • Secondary Heat Exchanger
    Provides additional heat to the furnace whilst maintaining high energy levels.

  • Low-speed Fan
    Ultra-low fan speed provides a quiet, continuous flow of warm air.

  • Lennox Duralok Plus® Heat Exchanger Assembly
    This is a Lennox developed heat exchanger assembly, made from patented Armour Tuf TM  steel.  It consists of a primary heat exchanger and a secondary condenser coil, ensuring high reliability and efficiency of the unit.

  • Integrated Two Stage / Variable Speed Blower Control
    The solid−state board contains all the necessary controls and relays to operate the furnace. The electronic flame sensor assures safe, reliable operation.

  • Variable Speed Blower Motor
    DC Inverter, variable speed motor maintains specified air volume from 0 through 200Pa static range.

  • Discreet Design
    The low−profile, narrow width cabinet allows ease of installation. The fully insulated cabinet includes foil faced insulation on the sides and back of the heating compartment, whilst minimising any functional noises.


Model Number



Star Rating*


Output High/Low


17.9 / 12.6




Airflow Range

(L/S @ 0-200Pa)

295 - 660

Add-on Cooling

(kW Recommended)

6.5 - 12.2


Unit Dimensions W x H x D


446 x 1016 x 724




* When tested in accordance with AS/NZS 3823.2



LPG/Propane Conversion Kit (Optional)
For Propane models a conversion kit is required for field changeover from natural gas. Kit is not included and must be ordered separately. Contact your Lennox Dealer for an order number.

Thermostat (Optional)
All Lennox gas furnace systems can be used with a range of easy to operate controls that enable you to select your desired temperature anywhere in your home with the simple touch of a button.

Add-on Cooling (Optional)
Lennox add-on cooling can be installed with most of the popular existing gas ducted heaters, at the same time as your gas furnace installation or at a later stage depending on your comfort and budget requirements.

Evaporator Coils (Optional)
Cooling Coils are available for field installation in supply air duct.

Humidifer (Optional)
Lennox Humidifer range is fully compatible and is available for attachment.

Air Filter (Optional)
Lennox air filters are fully compatible with these models.


GasFurnace G61 Series 0517 BrochureThumbnail

Download the brochure for this product

Lennox Gas Furnace G61 Series


Contact Us

Lennox heating and

air conditioning

(a division of Heatcraft

Australia Pty Ltd)

ACN 000 056 717

Australia 13 23 50

New Zealand 0800 653 330

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