What Size Clean Burn Furnace Does Your Shop Need?
The right Clean Burn furnace depends primarily on your monthly waste oil production, heating demand, and building size rather than square footage alone. A shop generating less than a couple hundred gallons a month rarely needs anything past the CB-140 or CB-1750, while a four-bay operation running through a thousand gallons a year is already in CB-2500 territory. That's the core of waste oil furnace sizing: matching BTU output to how much heat your space loses, not just how many square feet it covers. Ceiling height, insulation quality, open bay doors, and equipment layout all affect how much heat your building loses, which directly influences the furnace capacity you'll need. Spaces with limited clearance do better with a low-profile model, which rules out some of the taller units regardless of BTU need.
Does Oil Storage Location Change Which Model You Need?
Oil storage location affects fuel delivery distance, cold weather performance, and installation flexibility, making it an important factor when comparing Clean Burn furnace models. Every Clean Burn furnace runs on an oil bath metering pump that supports fuel lines up to 300 feet, which means outdoor storage tanks stay usable even through a Colorado winter without a separate heat trace system. Shops storing oil indoors have more flexibility on model choice, since line length and cold weather performance stop being limiting factors. Ventilation still matters regardless of storage location, and auto shop ventilation requirements should factor into where any furnace gets installed, not just which model you pick.
Clean Burn Furnace Comparison by Model
Every model in this comparison builds on Clean Burn's original 1979 furnace, and that engineering history continues to influence the performance, reliability, and design of the lineup today.
| Model | BTU/hr Output | Best Fit | Standout Feature |
|---|---|---|---|
| CB-140 | 140,000 | Single bay garages | Longest cleaning interval in the lineup |
| CB-1750 | 175,000 | Low volume shops | No fuel adjustment required |
| CB-2500 | 250,000 | Two to four bay shops | Most requested size, flexible mounting |
| CB-3250 | 325,000 | Larger spaces, low clearance | Low profile design for tight ceilings |
| CB-3500 | 350,000 | Four or more bay facilities | Automatic flow control, industrial grade |
| CB-5000 | 500,000 | Large repair facilities | Highest output, minimal upkeep |
Full specs and installation details live in the product manual for whichever unit ends up fitting your shop.
Waste Oil Furnace Comparison by Industry
This waste oil furnace comparison shows how different industries generate varying amounts of waste oil, making the right furnace model largely dependent on the type of operation you run.
Agricultural operations and smaller fleet yards tend to land on the CB-1750, since the oil volume thresholds that separate casual generators from regular ones sit well within that furnace's range. Marinas and equipment shops with taller, more open floor plans often do best with the CB-3250, since its low-profile design handles awkward ceiling heights better than a standard blast tube unit. Large dealerships and heavy equipment operations generating the most waste oil are the ones that need the CB-5000.
Get Matched to the Right Clean Burn Furnace Models
After reviewing this Clean Burn furnace comparison, the next step is matching your shop's heating demand and waste oil production to the right model. Interstate Energy, as an authorized distributor for Clean Burn, has installed and serviced every one of these furnace models across Colorado and eastern Wyoming, so sizing your shop correctly isn't a guess on our end.
Tell us your bay count and how much oil you're generating, and contact our team for a straight answer on the model built for exactly how your shop runs.