Lennox SLO185V Variable-Speed Oil Furnace

The Lennox SLO185V oil furnace offers variable-speed airflow for consistent comfort, efficient operation with up to 87% AFUE, a performance-enhancing Beckett burner, and nearly silent heating with SilentComfort technology.

Category: Furnace Brand: Lennox

Key features and benefits of the Lennox SLO185V oil furnace include variable-speed airflow for even heat distribution, high efficiency up to 87% AFUE for energy savings, a Beckett burner for efficient combustion, SilentComfort technology for quiet operation, and positive customer reviews for performance and comfort.

The Lennox SLO185V oil furnace comes with a warranty satisfaction rating of 4/5, providing peace of mind for customers in case of any unexpected issues or repairs.

About the Lennox SLO185V Variable-Speed Oil Furnace

Who this furnace is for

This Lennox oil furnace fits a defined heat-load range. Sizing isn’t done by the square footage of the home alone: a proper Manual J load calculation accounts for insulation, air sealing, window quality, basement conditioning, and ductwork. A furnace too big short-cycles and wears out faster; one too small runs flat-out on the coldest day and never quite catches up.

Why customers pick Lennox

Lennox sits at the premium end of the residential HVAC market. The brand pioneered ultra-high efficiency variable-capacity systems and has been a go-to for homeowners who value quiet operation, tighter temperature control, and longer equipment life over upfront price.

Installation notes

A furnace install involves the cabinet itself plus venting (B-vent for mid-efficiency, PVC for condensing), a condensate drain on condensing models, a properly sized gas line, a chimney liner adjustment if you’ve gone from mid- to high-efficiency, electrical, thermostat wiring, and a TSSA-permit gas safety inspection. Old equipment removal and disposal are part of the job.

Warranty and rebates

Lennox furnaces in this tier typically carry a 10-year limited parts warranty and a 20-year-to-lifetime heat exchanger warranty when registered. Oil furnace replacements typically don’t qualify for the gas-utility rebates, but converting to a high-efficiency heat pump may unlock the Canada Greener Homes program.

Available with professional installation by our TSSA-licensed technicians. Call (647) 558-5528 for a quote.

SEER	16
AFUE (%)	87
Motor	Variable Speed
Burner Type	Beckett® NX Burner

No Returns or Exchanges: All products are final sale.
No Refunds: We do not offer refunds for any items.
Shipping Cost: Flat rate of $250 (in the Greater Toronto Area). Additional charges may apply in some areas.
Warranty: Manufacturer’s warranty applies, as outlined by the manufacturer.
Estimated Delivery Time: 4–9 business days.
Installation Service: Optional. You can choose whether you want installation.
- For the Greater Toronto Area, installation is provided by NorthWind HVAC.
- For areas outside the GTA, our partners will contact you to coordinate installation.