Pressure washer has a relatively low water consumption

Even though manufacturers emphasise the low water consumption of pressure washers in ecological and economic terms, there is another decisive parameter. In contrast to the water hose on the public supply line, the device consumes electricity, which puts the water savings into perspective.

Effectiveness only in relation

The water consumption of a pressure washer is not only a cost factor, but the decisive technical criterion for effectiveness and efficiency. The impact pressure of the high-pressure cleaner of 100 to 200 bar must be put into relation with the amount of water.

Also of interest: How many Bar do I need for my Pressure Washer?

If the water pressure is too low, a lot of pressure is lost through the atomising and non-impacting water jet. The less concentrated the pressure is used, the more pressure force is lost. The relationship between water volume and pressure is not linear. The more water flows in, the less hydraulic or technical pressure the high-pressure cleaner needs.

Example:

  • 180 bar set pressure and 700 litres of water per hour = 0.6 bar working pressure
  • 180 bar set pressure and 1200 litres of water per hour = 1.2 bar working pressure

Example calculation for surface cleaning

A garden hose delivers water at a line pressure of two and four bar. With a pressure washer, the drive energy (electricity consumption) must be included in the cost calculation. The following consumption values can be compared for one hour:

  • A water hose with four bar needs about 3,500 litres of water per hour.
  • A pressure washer with 145 bar needs about 500 litres of water and 2,000 watts (2 kW) per hour.

The average cost of water in United Kingdom is about two pound cents (0.02 £) per litre. The average cost of electricity in United Kingdom per kW/h is about thirty pound cents (0.30 £).

  • Using a water hose costs about 3,500 x 0.2 £, which is equivalent to seven pounds
  • With the high-pressure cleaner there are about 500 x 0.2, which corresponds to one pound

and 2,000 kW/h electricity consumption, which equals six pounds.

The decisive savings factor is the time spent on cleaning. If the desired cleanliness is achieved after twenty minutes with the pressure washer, a cost saving of two-thirds (4.33 pounds) can be booked.

Household appliances deliver water quantities of 450 to 600 litres per hour at a pressure of up to 200 bar. Semi-professional units can deliver 600 to 900 litres per hour.

Alfred Harper

Alfred Harper

Alfred Harper is a former consultant and product expert at a company producing cleaning equipment. He was working at this position for more than 10 years and has gained incredible experience and knowledge as he has tested almost all pressure washers brands and models and became an expert in this field. Now, he is writing reviews and how-to articles about pressure washers and makes a great contribution to the Pressure Washers company to help people to choose the best cleaning equipment for home use.

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