The biggest difference is the style of heating coil. (The coil is hundreds of feet of superior Schedule 80 ASTM pipe rolled in a cylindrical shape). While Hotsy uses Schedule 80 pipe, it’s important to note not all manufacturers do. Some choose to use tubing or Schedule 40 coil. The coil is heated by a burner using oil, natural gas, or liquid propane for fuel. The burner heats the coil and the heated coil heats the water as it flows through the coil.

Your options are to buy a power washing machine with a horizontal lay-down coil, or buy one with an upright coil. The horizontal coil design typically is more compact because the coil is lying down, so the height of the pressure washer can be less (although the machine may be longer). An upright coil has the burner at the bottom of the coil instead of at the side as with a horizontal coil. Since heat rises, it rises up from the bottom of the vertical coil past all the coils and out the top. This is the most efficient coil for heating and energy usage, and produces hotter water, which cleans better.

Hotsy industrial pressure cleaning systems use vertical coils exclusively, both for energy efficiency and for higher water temperature. In addition, Hotsy has 11 different size coils for our 80 models of hot water pressure washers. Many manufacturers have just one or two coil sizes. Hotsy coils can be matched to the amount of water to be pumped through them, for maximum temperature while using the least amount of fuel possible.