Sun Pro Supply repairs commercial hot-water pressure washers for fleet, industrial, food-service, and municipal operations across Jacksonville and Northeast Florida. We’re the exclusive authorized Hotsy dealer for Duval County — which means genuine Hotsy parts, manufacturer-backed warranty work, and service documentation that stands up in a maintenance log.
Hot-water machines fail differently than cold-water machines. On a hot-water unit, the burner, the heating coil, and the fuel system feeding them are where most service calls land — the pump is often the innocent party. We work on all three systems, either onsite at your facility or drop-off at our shop at 5466 West Beaver Street, where we sell and service commercial pressure-washing equipment for operations across Northeast and North Central Florida.
Burner assembly: fuel pump and fuel pressure, fuel nozzle and spray pattern, ignition electrodes and transformer, flame sensor, air band and combustion adjustment, fuel solenoid valve, burner motor, blower fan and belt.
Fuel system: contaminated or stale fuel, water in the fuel, plugged fuel filter and water separator, restricted fuel lines, tank sludge and varnish, soot-remover treatment.
Heating coil and heat exchange: hard-water scale (descaling), soot buildup from incomplete combustion, high-temperature limit trips, coil replacement when the tube is compromised.
Water and pressure side: pump packing and seals, valves, unloader valve, flow / vacuum / pressure switch, thermal relief, detergent injection and metering.
Controls and electrical: burner switch and thermostat, high-temperature limit switch, relays and wiring, burner motor overloads, and generator output on engine-driven units where low voltage affects burner RPM.
Every diesel-fired burner on a hot-water machine needs the same three inputs. When one of them is missing, the machine pumps cold water all day.
Working in that order is fast and cheap: confirm the fuel supply and filter, verify spark at the electrodes, then look at the air-to-fuel mixture. Our guide, Why Your Hot-Water Pressure Washer Burner Won’t Fire, walks through the twelve failures we see most often — including the smoke-color test that tells you whether a burner is running rich or lean.
Safety note: an oil burner that fails to light correctly can flood the combustion chamber with unburned fuel. Unburned fuel saturates the insulation and creates a fire risk, and incomplete combustion produces carbon monoxide. Don’t keep cycling a burner that is smoking or failing to light — shut it down and have it inspected.
Both of these degrade performance gradually, so they tend to get blamed on the machine simply getting old instead of being repaired.
Scale builds up inside the heating coil whenever hard water is heated. Municipal and well water across Northeast Florida both carry dissolved minerals that precipitate out as the water heats. The symptoms arrive in an order: longer heat-up time, then a lower temperature at the gun than the thermostat setting implies, then the high-temperature limit switch starts tripping, then flow is restricted enough to affect pressure and auto-start function. Descaling with a pressure-washer coil cleaner circulated through the coil removes the mineral layer and restores heat transfer. Facilities on hard water should also consider a water softener ahead of the machine — it costs far less than accelerated coil replacement.
Soot is the exhaust-side version of the same problem. When a burner doesn’t burn cleanly, it deposits a black layer on the outside of the coil. That layer insulates the coil, sending heat out the exhaust stack instead of into your water, and it blocks airflow through the heat exchanger. Soot comes from dirty or stale fuel, a partially plugged fuel nozzle, worn or misadjusted electrodes, an air/fuel mixture out of adjustment, or low voltage making the burner motor run slow. Black smoke is never normal. A slight puff of white smoke at ignition is normal; sustained white smoke is not.
If your hot-water machine makes heat but delivers weak pressure, the burner isn’t the problem. The usual causes: a worn spray nozzle (the orifice erodes and pressure drops), an inlet water supply that can’t meet the machine’s GPM requirement, air drawn in through a loose fitting or a clogged chemical injector, worn pump packing and seals, or a sticking unloader valve. The unloader is worth ruling out before anyone quotes you a pump — the symptoms are nearly identical and the fix costs a fraction as much. Every commercial pressure washer also needs its scheduled service and repair intervals kept up, not just the machines that are already broken.
We’re an authorized retail and repair center for Hotsy and Ramteq, and we service all major commercial pressure-washing brands. Configurations we work on include diesel-fired hot water, gas-engine driven, electric, LP and natural-gas fired, skid- and trailer-mounted systems, and steam-option machines. If you’re weighing a replacement instead of a repair, start with our equipment lineup or ask us to spec a system against how you actually clean.
Bring the machine in, or have us come to it. Onsite work covers the seven-county territory we hold as Hotsy dealers: Duval, Clay, St. Johns, Putnam, Marion, Alachua, and Columbia counties. Drop-off is at 5466 West Beaver Street, Jacksonville, FL 32254 — open Monday through Friday, 7am to 4pm, closed most holidays. We’re located between Edgewood Avenue and Ellis Road, west of the I-10 / I-95 interchange and east of the I-295 / I-10 interchange.
Most of the burner failures we repair are maintenance failures. A commercial hot-water machine needs:
Ask us about a maintenance agreement so the intervals are tracked for you rather than remembered in the middle of a breakdown.
We support the operations that can’t afford cold water and downtime: fleet and trucking operations washing tractors, trailers, and yard equipment; industrial and manufacturing plants cleaning process areas and floors; food-processing and restaurant facilities degreasing back-of-house; utilities and municipal fleets; aviation ground-support and hangar operations; railroad and rail-facility customers; and government and institutional buyers who need formal quotes and documentation on request.
Why does my hot-water pressure washer run but never get hot?
Almost always the burner: no fuel, a plugged fuel filter, a clogged fuel nozzle, no spark at the electrodes, or a flow or vacuum switch that isn’t telling the burner the trigger is pulled. Less commonly it’s a scaled coil absorbing heat it can’t transfer, or a failed thermostat or high-limit switch. The order to check is fuel, air, spark.
What does black smoke from the burner mean?
Incomplete combustion — too much fuel for the air available. It soots the coil, wastes fuel, and produces carbon monoxide. It’s usually a worn or wrong-size fuel nozzle, a blocked air intake, a dirty filter, or an air band that needs adjustment. Don’t keep running it while it smokes.
How often should a commercial hot-water burner be serviced?
For commercial duty, an annual tune-up is the practical minimum, and many operators on heavy use get one at roughly 200-hour intervals. Fuel filters get replaced every 3 to 6 months regardless, and coils in hard-water areas should be descaled annually.
Can you service my machine at my facility?
Yes. We offer onsite service across Duval, Clay, St. Johns, Putnam, Marion, Alachua, and Columbia counties, plus drop-off at our Jacksonville shop Monday through Friday, 7am to 4pm.
Do you repair brands other than Hotsy?
Yes. We’re an authorized retail and repair center for Hotsy and Ramteq, and we service all major commercial pressure-washing brands.
Call (904) 693-2155 or request a service visit with your machine’s make, model, and what it’s doing (or not doing). If it’s a burner issue, tell us whether you have no heat at all, weak heat, or heat with smoke — that tells our technicians where to start.
