Pressure Washer Generators

On a hot water rig, the generator has one job. It feeds 120 volt power to the burner while the engine runs, and when it quits you are a cold water outfit until it is fixed. Sun Brite Supply carries the Winco belt drive generators most skids were built around. Call 301-519-9274 before you order and we will confirm yours is the right match.

Sizing a Belt Drive Generator for a Hot Water Burner

Most gas-fired hot water pressure washers run a 120 volt burner circuit. The engine spins a small generator by belt, and that generator powers the blower motor, the fuel pump, and the ignition transformer. The Winco TB2400E ($755.00) is the standard replacement in this class: 2400 watts, 20 amps at 120 volts, single phase, with a two-bearing design built to handle belt side load without wearing out the shaft.

Two numbers matter when you swap one in. First is speed. The generator has to turn 3600 RPM to make clean 60 Hz power, so match your pulley diameters to the originals instead of grabbing whatever is on the shelf. Second is horsepower. A belt drive generator takes 1 to 2 HP off the engine to run, which is why hot water machines carry bigger engines than cold water units with the same pump.

The quiet killer here is a loose belt. When the belt slips, generator RPM drops, voltage sags, and the ignitor spark goes weak. Crews chase fuel problems for an hour when a voltmeter would find it in two minutes. A healthy system reads near 120 volts at the burner with the engine at speed.

Thinking about converting to a 12 volt burner instead? It drops about 70 pounds, but your charging system must produce at least 16 amps, and 12 volt burner components cost more when they fail. On an existing skid, replacing the generator is almost always the cheaper fix.

Hot Water Rig Parts

• Burner parts and burner nozzles
• Ignitors and ignition transformers
• Thermostats and switches
• Fuel nozzles and fuel pumps
• Electrical components
• Hot water pressure washers and hot water skids

Frequently Asked Questions

What does the generator on a hot water pressure washer power?

It runs the 120 volt burner circuit: the blower motor that pushes combustion air, the fuel pump that pressurizes diesel to the nozzle, and the transformer that fires the spark.

Why does my burner misfire when the generator looks fine?

Check voltage before anything else. A slipping belt drops generator speed, output sags below 120 volts, and the spark weakens. Tension the belt, then meter the burner feed with the engine at full speed.

How fast does a belt drive generator need to spin?

3600 RPM. That speed produces 60 Hz power at the rated voltage. Wrong pulley sizes mean wrong RPM, and both high and low hurt the burner motor over time.

Is 2400 watts enough to run a burner?

Yes for nearly every skid-mounted burner. Typical burner loads draw well under the TB2400E's 20 amp limit, which leaves headroom for startup surge from the blower motor.