Choosing a reliable and efficient oil furnace is essential for homeowners seeking lasting warmth and energy savings. Lennox is known for advanced engineering and solid performance in heating systems. This article delivers detailed Lennox oil furnace reviews, focusing on performance, efficiency ratings, features, and user experiences. Readers will also find comparisons with leading competitors and advice for selecting, maintaining, and installing the ideal Lennox oil furnace.
Lennox Oil Furnaces: Overview And Brand Reputation
Lennox International Inc. is one of the oldest and most respected names in the heating and air conditioning industry. The company offers a diverse range of heating solutions, including premium oil furnaces known for high efficiency and reliability. Lennox oil furnaces cater to households in colder climates or in regions where natural gas is unavailable, providing a robust alternative without sacrificing comfort.
Recognized for its innovation, Lennox incorporates advanced features like variable-speed blower motors and precision engineering. Their oil furnaces are widely installed in residential homes, rural properties, and older buildings due to their compatibility with existing oil infrastructure.
Core Features Of Lennox Oil Furnaces
Efficiency And AFUE Ratings
Lennox oil furnaces are designed with efficiency in mind, measured by the Annual Fuel Utilization Efficiency (AFUE). Higher AFUE ratings indicate better fuel efficiency, translating to lower operating costs. Most Lennox models offer AFUE ratings between 82% and 86%, positioning them as competitive choices in the oil furnace market.
Quiet And Consistent Heating
Several Lennox models use insulated cabinets and advanced blower technology to operate quietly and deliver consistent heat. This is especially important in residential settings, where noise levels impact comfort. Multi-speed blowers and sealed combustion chambers play a large role in reducing operational noise.
Durability And Build Quality
Lennox furnaces are manufactured with heavy-gauge steel cabinets and corrosion-resistant heat exchangers. This solid construction ensures longevity, particularly in demanding climates where furnaces work harder. Many parts, including heat exchangers and burners, are backed by multi-year warranties.
Smart Controls And Integration
Modern Lennox oil furnaces often support smart controls and can be paired with advanced thermostats. This enables homeowners to customize comfort settings and monitor energy use. While not all models offer direct Wi-Fi integration, they work seamlessly with various third-party thermostat solutions.
Lennox Oil Furnace Models: In-Depth Reviews
Lennox currently manufactures several oil furnace models tailored for residential and light commercial use. Here are the most popular options:
| Model | AFUE Rating | Heating Capacity (BTU/h) | Key Features |
|---|---|---|---|
| EL0185E | 85% | Up to 140,000 | Variable-speed blower, heavy-gauge cabinet, Beckett burner |
| OL5E | 83% | Up to 154,000 | Compact design, clean combustion, optional side venting |
| OL6E | 83% | Up to 154,000 | Efficient combustion, easy filter access, insulated cabinet |
| SLO185V | 85% | Up to 140,000 | Variable-speed motor, ultra-quiet, durable heat exchanger |
Lennox EL0185E Oil Furnace
The EL0185E leads Lennox’s oil furnace lineup. With an AFUE rating of 85%, it’s built for homes needing efficient yet robust heating. Customers appreciate the variable-speed blower, which adjusts airflow for comfort and reduced energy use. The chassis features thick insulation, a solid steel cabinet, and a Beckett® oil burner for reliable ignition. The EL0185E fits well in larger homes and in climates with harsh winters.
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Lennox OL5E And OL6E Oil Furnaces
The OL5E and OL6E are similar in terms of capacity and efficiency, both offering up to 83% AFUE. They are distinguished by their compact footprints, making them ideal for installations in tight spaces. Both models boast easy-access filter compartments, streamlined combustion for lower emissions, and quiet operation. These models are common in retrofits and can work with multiple venting configurations.
Lennox SLO185V Oil Furnace
The SLO185V combines efficiency with comfort. Its variable-speed blower motor not only delivers precise temperature control but also helps lower utility bills. Homeowners report that this model operates with minimal noise and distributes heat evenly throughout the space. The heat exchanger has a stainless-steel secondary section, enhancing durability and efficiency. This model suits homeowners wanting advanced performance along with savings.
Efficiency Ratings And Operational Costs
AFUE, or Annual Fuel Utilization Efficiency, measures the percentage of oil that is converted to heat. An 85% AFUE furnace, for example, turns 85% of the oil it burns into usable heat, with the remainder lost via exhaust. The higher the AFUE, the less wasted energy and more money saved on fuel.
- Lennox oil furnaces average 82% to 86% AFUE, positioning them among the most efficient oil-burning options.
- Higher AFUE reduces annual fuel costs, particularly in regions where winters are severe.
- Proper sizing and setup by a qualified technician maximize these efficiency gains.
It’s important to weigh initial purchase and installation costs against long-term fuel savings. While high-AFUE models may cost more upfront, they often pay for themselves through reduced heating bills over their lifespan.
User Reviews And Customer Satisfaction
User feedback about Lennox oil furnaces centers on quiet operation, steady performance, and ease of maintenance. Many report significant improvements in indoor comfort and lower heating costs after upgrading from older, inefficient furnaces. Warranty service and technician support are frequently cited as positive aspects of the ownership experience.
Some users point out that routine maintenance (such as oil filter changes and annual burner tune-ups) is crucial. While Lennox units are robust, neglecting upkeep can lead to reduced efficiency or early failure. Serviceability is appreciated, as critical components are accessible for professional cleaning or repair.
Comparison With Other Leading Oil Furnace Brands
Lennox oil furnaces compete primarily with models from Carrier, Thermo Pride, and Adams Manufacturing. Each brand has unique features and price points:
| Brand | AFUE Range | Notable Features | Typical Price Range (Installed) |
|---|---|---|---|
| Lennox | 82–86% | Variable-speed blowers, smart controls, robust warranties | $4,500–$7,500 |
| Carrier | 82–86% | Advanced air filtration, two-stage burners, quiet design | $5,000–$8,000 |
| Thermo Pride | 85–87% | Heavy-duty build, long life, exceptional heat exchangers | $4,000–$8,500 |
| Adams Mfg. | 83–86% | Innovative three-pass heat exchangers, compact size | $4,200–$7,000 |
Lennox stands out in this group for its advanced blower options and compatibility with home automation systems. Thermo Pride is favored for sheer build quality, while Carrier appeals to users seeking integrated air purification. Adams Manufacturing is a popular value brand. Overall, Lennox consistently ranks high in performance and overall satisfaction.
Installation Considerations And Professional Setup
Proper installation is vital for oil furnace performance and longevity. Lennox oil furnaces require certified HVAC professionals for installation, calibration, and testing. Poorly installed units may operate inefficiently, produce excessive noise, or encounter premature failures due to airflow issues.
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Key considerations in selecting and installing a Lennox oil furnace include:
- Accurate sizing based on the home’s square footage and insulation level
- Oil tank placement and connection
- Appropriate venting for exhaust gases (chimney or direct vent)
- Safe fuel line routing
- Commissioning for combustion efficiency and safety
Lennox partners with a network of authorized dealers who are trained in these best practices.
Maintenance, Longevity, And Troubleshooting
Long-term satisfaction with any oil furnace depends on regular care. Lennox furnaces are engineered for easy maintenance access, helping homeowners and technicians keep critical parts like burners, filters, and heat exchangers in optimal condition.
Annual Maintenance Tasks
- Oil and air filter replacement
- Burner and nozzle cleaning
- Inspection and cleaning of the heat exchanger
- Sight glass and safety controls check
- Testing ignition controls and thermostats
Most common minor issues—such as short cycling, noise, or uneven heating—are often resolved with simple adjustments or component replacements. Major problems, such as cracked heat exchangers or oil leaks, should always be handled by professionals. When properly maintained, Lennox oil furnaces typically last 20–25 years.
Energy Efficiency And Environmental Considerations
Oil furnaces, including Lennox’s models, typically use No. 2 heating oil. While this is a fossil fuel, modern oil furnaces are much more efficient and cleaner-burning than older technologies. Newer Lennox oil furnaces emit fewer particulates and comply with most state air quality standards.
For homeowners considering a greener profile, low-sulfur heating oil or biofuel blends (up to B20 in some regions) may be used. This can reduce emissions without requiring major furnace modifications. Always confirm fuel compatibility with your installer before opting for alternative blends.
Thermostat Options And Smart Home Integration
Pairing a Lennox oil furnace with the right thermostat enhances comfort and convenience. Lennox oil furnaces are compatible with most programmable and smart thermostats, including Lennox’s own iComfort series for maximum integration.
Benefits include:
- Precise scheduling to match occupancy patterns
- Remote temperature adjustments via smartphone app
- Energy usage tracking and reporting
- Seamless integration with voice assistants (Alexa, Google Assistant)
Even basic programmable thermostats can improve efficiency, but smart thermostats offer additional features to support comfort and savings.
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Cost To Buy, Install, And Operate A Lennox Oil Furnace
The cost to purchase and install a Lennox oil furnace varies based on home size, local labor rates, and installation complexity. Average costs range from $4,500 to $7,500 for a professionally installed system. This includes the furnace, standard controls, and connection to an existing oil tank. Modifications to ductwork, vents, or electrical service may increase the price.
Operating costs depend on fuel oil prices, local climate, furnace efficiency, and maintenance practices. With current average U.S. heating oil prices and a well-insulated home, annual heating costs can be calculated using:
- Expected AFUE rating
- Annual heating degree days
- Home insulation and airtightness
Many utility companies offer online calculators to help estimate oil furnace operational costs for your ZIP code.
Pros And Cons Of Lennox Oil Furnaces
| Pros | Cons |
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Best Scenarios For Lennox Oil Furnace Installation
Lennox oil furnaces are an excellent fit for:
- Homes and properties in rural areas without access to natural gas lines
- Colder climates where steady, robust heat is required
- Homeowners upgrading from outdated oil heating equipment
- Retrofits in older properties with existing oil tank infrastructure
For those seeking long-term value, advanced comfort options, and reliable service, Lennox remains a top choice.
How To Select The Right Lennox Oil Furnace
Choosing the best model involves several factors:
- Calculate the required heat output (BTU/h) based on home size and insulation
- Decide on desired efficiency and upfront budget
- Consider available space for installation (vertical/horizontal, compact models)
- Evaluate features like variable-speed blowers or smart thermostat compatibility
- Ask about warranty length and local dealer support
Lennox dealers offer on-site assessments and can provide personalized recommendations for model and sizing.
Warranty And After-Sales Support
Lennox supports its oil furnaces with industry-standard warranties. Most models include:
- Lifetime limited warranty on heat exchanger
- 5- to 10-year limited warranty on covered components
- Optional extended labor coverage available through authorized dealers
Prompt, qualified service is part of the Lennox dealer network. Registration after installation ensures warranty protection and access to technical resources as needed.
Frequently Asked Questions About Lennox Oil Furnaces
Can Lennox Oil Furnaces Be Converted To Gas?
Lennox oil furnaces are not typically convertible to natural gas. If switching fuels, it is best to invest in a dedicated gas furnace. Consult a Lennox dealer for options specific to your home.
Are Lennox Oil Furnaces Eligible For Energy Rebates?
Some utility and government programs offer rebates for high-efficiency oil furnaces. Models with AFUE 85% or higher may qualify, depending on your location. Check with local energy providers before purchase.
How Often Should Oil Furnace Maintenance Be Performed?
Annual professional maintenance is recommended. Filters may need replacement every 1–3 months, especially during peak use in winter.
Is Installation Disruptive?
Replacing an old oil furnace with a new Lennox model typically takes 1–2 days and can often use existing ductwork and oil lines.
Summary Table: Key Lennox Oil Furnace Features At A Glance
| Model | AFUE | Best For | Features |
|---|---|---|---|
| EL0185E | 85% | Mid-to-large homes, high efficiency | Variable-speed, Beckett burner, insulated cabinet |
| OL5E | 83% | Space-limited retrofits | Compact, quiet, clean combustion |
| OL6E | 83% | Older properties, flexibility | Efficient, easy maintenance, multi-venting |
| SLO185V | 85% | Top performance seekers | Variable-speed, ultra-quiet, durable |