Gas Furnaces

Merit ML180 Furnace WEB

Lennox Merit SeriesTM Mid Efficiency Gas Furnace

When you want to feel warm without feeling the pinch of high energy bills, the Lennox Merit SeriesTM gas furnace offers a reliable and economic solution.

The Lennox Merit SeriesTM gas furnace has a 3.8 (average) star efficiency rating for internal applications and a 2.8 (average) star efficiency rating for external applications.

The versatile design makes it extremely installer friendly.
(Internal model pictured) 


Key Features

  • DURALOCK™ Heat Exchanger
    Made out of patented Armour Tuf™ aluminised steel construction ensures superior resistance to corrosion and oxidation. This compact design allows complete exposure of heating surfaces to supply air stream whilst reducing space requirements inside the heater cabinet.

  • Induced Draft Combustion Blower
    Exceeds industry standard airflow for even temperatures and improved comfort. Blower compartment minimises losses and maximises efficiency and comfort.

  • SureLight(R) Ignitor
    Solid-state electronic direct spark ignition control provides positive and safe main burner ignition insuring reliable start every time the heater fires up. This spark is intermittent and occurs only when required.

  • SureLight(R) Integrated Furnace Control
    Controls all furnace operations and provides direct readout diagnostics for quick troubleshooting.

  • Cabinet
    Constructed of heavy gauge, cold rolled steel with a primed and pre-painted topcoat finish. The cabinet surface temperatures are low due to foil faced fibreglass insulation on side and back panels of heat section.

  • Flame Rollout Switches
    Manual reset switch is furnished as standard and is factory installed on the burner box. Switch prevents unit operation in the event combustion products’ passage through the flueway is reduced or blocked.

  • Transformer
    24 volt (40VA) control transformer is furnished as standard equipment and is factory installed on control panel.


Model Number



Application: Internal

Star Rating*








Airflow Range


665 - 1165

Add-on Cooling


14.1 - 17.6


Unit Dimensions W x D x H


533 x 724 x 838




* 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.

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

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.

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.


Lennox ML180 Mid Efficiency Gas Furnace

 Download the brochure for this product

 Lennox Merit Series Gas Furnace




Contact Us

Lennox heating and

air conditioning

(distributed by Kirby HVAC&R Pty Ltd)

ABN 42 624 910 041

Australia 13 23 50

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