The 500 Series comes in 4 models:

Model 555SS Portable Hotsy Hot Water Electric Pressure Washer – 2.2 GPM @ 1300 PSI, 2HP 115V/1PH 20 AMP Baldor Electric Motor, Fuel Oil-Fired, Direct Drive Hotsy Duplex Pump, Trigger Gun Shut-Off, 50’ High Pressure Hose, 37’ GFCI Equipped Power Cord, Shipping Weight 360lbs (214,300 BTU/HR). Dimensions: 33″L x 27″W x 41.5″H. See the operator’s manual for this model

Model 558 Hotsy Hot Water Electric Pressure Washer – 2.2 GPM @ 1300 PSI, 2HP 115V/1PH 18 AMP Baldor Electric Motor, LP-Fired, Optional Portability, Direct Drive Hotsy Duplex Pump, Trigger Gun Shut-Off, 50’ High Pressure Hose, Shipping Weight 350lbs (227,000 BTU/HR). Dimensions: 31.5″L x 26″W x 41″H. See the operator’s manual for this model

Model 560SS Portable Hotsy Hot Water Electric Pressure Washer – 2.1 GPM @ 1500 PSI, 2.3HP 115V/1PH 20 AMP Baldor Electric Motor, Fuel Oil-Fired, Direct Drive Hotsy Triplex Pump w/NESTechnology, Trigger Gun Shut-Off, 50’ High Pressure Hose, 37’ GFCI Equipped Power Cord, Shipping Weight 395lbs (214,300 BTU/HR). Dimensions: 33″L x 26″W x 44″H. See the operator’s manual for this model

Model 680SS Portable Hotsy Hot Water Electric Pressure Washer – 3.0 GPM @ 1000 PSI, 2HP 115V/1PH 20 AMP Baldor Electric Motor, Fuel Oil-Fired, Direct Drive Hotsy Triplex Pump w/NESTechnology, Trigger Gun Shut-Off, 50’ High Pressure Hose, 37’ GFCI Equipped Power Cord, Shipping Weight 405lbs (289,900 BTU/HR). Dimensions: 33″L x 27″W x 45.5″H. See the operator’s manual for this model