Why Fuel Selection Matters for Your Hotsy Pressure Washer
When most operators think about pressure washer maintenance, they focus on oil changes, pump care, hoses, or keeping filters clean. But one of the most overlooked factors affecting performance, reliability, and repair costs is something much simpler: fuel selection.
At Hotsy Cleaning Systems, we’ve seen a growing number of service issues tied directly to poor fuel quality — especially in diesel-fired hot water pressure washers. In many cases, these problems could have been avoided entirely with the right fuel choice.
If you rely on your equipment every day, understanding what goes into your fuel tank can save you thousands in downtime and repairs.
The Hidden Problem with Modern Diesel Fuel
Many diesel fuels available at standard gas stations today contain biological content or biodiesel blends — sometimes up to 20%. The challenge is that this isn’t always clearly labeled at the pump.
While these fuels may work adequately in standard compression-ignition diesel engines, Hotsy burner systems operate differently.
Your Hotsy hot water pressure washer uses a fuel oil burner system that relies on:
- Spark ignition
- Precise fuel atomization
- Clean combustion
When biodiesel blends sit in a tank — especially during seasonal storage — the biological content can begin to separate, gel, or leave behind contaminants. Over time, that buildup can create major problems inside the burner system.
Common Fuel-Related Problems We See
Fuel quality issues typically show up gradually, but they can quickly lead to expensive repairs if ignored.
Some of the most common symptoms include:
Clogged Filters & Nozzles
Biological material and contaminants can plug fuel filters and burner nozzles, restricting fuel flow and reducing performance.
Poor Combustion
When the burner system isn’t receiving clean, properly atomized fuel, combustion becomes inconsistent and inefficient.
Loss of Heat & Cleaning Power
Reduced burner efficiency means lower water temperatures and decreased cleaning effectiveness — costing crews more time on every job.
Excessive Smoke & Soot
Incomplete combustion can create carbon buildup, smoke, and residue throughout the burner system.
Hard Starts After Storage
Many of these issues become noticeable when equipment is pulled out after winter or extended storage periods.
The Real Cost of Bad Fuel
What starts as a small fuel issue can quickly become a major service bill.
Cleaning a burner system contaminated with unburnt fuel or biological residue is not a quick fix.
In severe cases, technicians must:
- Disassemble the entire burner system
- Manually clean heating coils
- Remove soot and residue buildup
- Rewrap insulation
- Replace clogged components
The average repair cost for this type of service can easily exceed $1,000.
More importantly, that repair means downtime — and downtime costs money.
Recommended Fuel Options for Hotsy Equipment
To help protect your equipment and maximize performance, Hotsy strongly recommends using clean, high-quality fuel with little to no biological content.
Best Option: Pure Diesel Fuel
Pure diesel with no biodiesel blend remains the best option for long-term burner performance and reliability.
Other Recommended Alternatives
Depending on availability in your area, these fuel options also perform well in Hotsy burner systems:
- Jet A fuel
- Home heating fuel
- Kerosene
Kerosene, in particular, is commonly available at Fleet Farm fuel pumps and is often a cleaner-burning option for seasonal operators.
Don’t Forget About Bulk Fuel Tanks
Even if you purchase fuel from a reputable supplier, it’s worth asking questions about the biological content in your bulk fuel storage.
We’ve seen situations where customers were unaware of the blend percentages in their tanks — leading to recurring service issues they couldn’t explain.
If you store fuel onsite, ask your supplier:
- What percentage of biodiesel is in the fuel?
- Is the fuel treated for long-term storage?
- How stable is it during seasonal temperature changes?
A quick conversation today can help prevent costly repairs later.
Protect Your Investment
Your Hotsy pressure washer is built to work hard in demanding environments. Choosing the right fuel is one of the easiest and most cost-effective ways to protect that investment.
Better fuel selection helps:
- Reduce maintenance costs
- Improve burner performance
- Extend equipment lifespan
- Prevent downtime
- Keep your pressure washer operating at peak efficiency
At Hotsy Cleaning Systems, we’re committed to helping customers get the most out of their equipment — not just selling machines.
If you have questions about fuel recommendations, burner performance, or preventative maintenance, our team is here to help.
