When ordinary pressure washers aren't enough, the Hotsy 851 Hot Water Pressure Washer delivers the heat, pressure, and commercial-duty construction needed for serious cleaning.
Producing 4.0 GPM at 3000 PSI, the Hotsy 851 combines a powerful 208V single-phase electric motor with a diesel-fired hot water burner to attack stubborn grease, oil, equipment buildup, sludge, dirt, and industrial grime.
This configuration is an excellent choice for automotive shops, fleet maintenance facilities, warehouses, manufacturing plants, food processing facilities, equipment service centers, municipalities, transportation operations, and other commercial or industrial facilities with 208V single-phase electrical service.
Commercial Hot Water Cleaning Power
The Hotsy 851 is powered by an 8.2 HP, 3450 RPM electric motor and delivers 4 GPM at 3000 PSI through a heavy-duty belt-drive pump system.
Where cold water relies primarily on pressure, the 851 adds high-temperature cleaning to help break down petroleum-based soils, grease and oily residue faster—making it particularly effective for equipment, vehicles, machinery, shop floors and other demanding applications.
381,000 BTU/hr Oil-Fired Burner
A high-efficiency upright oil-fired burner delivers up to 381,000 BTU/hr of heating capacity, giving commercial operators the advantage of hot water without requiring an electrically heated pressure washer.
The heating coil is protected by a corrosion-resistant stainless-steel coil skin, helping the machine withstand demanding commercial environments.
Heavy-Duty Belt-Drive Pump
At the heart of the Hotsy 851 is the HM4030R.3 crankshaft triplex pump.
The belt-drive configuration reduces pump operating speed compared with many direct-drive designs and is well suited for businesses that expect their pressure washer to work regularly rather than sit in storage.
An integrated float tank helps maintain a consistent water supply while reducing the chance of debris reaching the pump.
Built for Shops, Fleets & Industrial Facilities
Despite its industrial cleaning capability, the Hotsy 851 measures only 28 inches wide, allowing it to pass through many standard commercial doorways.
Mobility is handled by 12-inch solid rubber tires and front casters, while integrated forklift slots make moving or positioning the machine easier around larger facilities.
A protective cabinet surrounds the major components for a cleaner, professional installation and additional protection in demanding working environments.
Hotsy 851 Standard Features
- 4.0 GPM @ 3000 PSI
- 208V / Single-Phase electrical configuration
- 44-amp motor draw
- 8.2 HP electric motor
- 3450 RPM motor speed
- Heavy-duty belt-drive system
- HM4030R.3 triplex crankshaft pump
- 381,000 BTU/hr oil-fired hot water burner
- Stainless-steel coil skin
- Internal float tank
- Adjustable water temperature thermostat
- Water-resistant electrical control box
- 35-ft GFCI-equipped power cord
- 8-gallon polyethylene burner fuel tank
- Fuel gauge cap
- Adjustable upstream detergent injection
- 50-ft high-pressure hose
- 12-inch solid rubber tires
- Front swivel casters
- Integrated forklift slots
- 28-inch machine width
Ideal Applications
The Hotsy 851 is an excellent commercial pressure washer for cleaning:
Heavy Equipment • Fleet Vehicles • Trucks • Machinery • Engines • Shop Floors • Manufacturing Equipment • Automotive Components • Greasy Parts • Municipal Equipment • Construction Equipment • Agricultural Equipment • Warehouse Areas • Service Bays
Why Choose a Hotsy Hot Water Pressure Washer?
Hotsy equipment is built specifically for professional and industrial cleaning applications where reliability and serviceability matter.
The Hotsy 851 is particularly attractive for facilities that want the cleaning performance of a commercial hot water pressure washer while taking advantage of an existing 208V single-phase electrical supply.
Instead of relying on a gasoline engine indoors or installing a higher-voltage three-phase machine, the 851 provides a powerful electric-motor-driven solution paired with diesel-fired water heating.
Technical Specifications
| Specification |
Hotsy 851 |
| Pressure |
3000 PSI |
| Flow Rate |
4.0 GPM |
| Electrical |
208V / 1-Phase |
| Amperage |
44 Amps |
| Motor |
8.2 HP |
| Motor Speed |
3450 RPM |
| Pump |
HM4030R.3 Triplex Crankshaft |
| Drive System |
Belt Drive |
| Burner |
Oil / Diesel Fired |
| Burner Output |
381,000 BTU/hr |
| Burner Voltage |
230V |
| Fuel Tank |
8 Gallons |
| Heating |
Hot Water |
| Mobility |
Cart |
| Dimensions |
51" L × 28" W × 51" H |
| High-Pressure Hose |
50 ft |
