Tom Bosley -- who famously played Mr. Cunningham on  Happy Days  -- died this morning at a hospital in Rancho Mirage, CA ...
Average estimates: $250 to $420. Power washers can have pressures of 4,000 psi (pounds per square inch) to lesser pressures of maybe a few hundred and run by gas or electric. This means that professionals will probably use one with less pressure to clean a deck and maybe one with higher pressure to clean a patio.
They then multiplied this by an average electricity price of 14.5 pence per kWh. For example, the average cost of running a combined washing machine and tumble dryer is Â£80 a year. The analysis even stretches to seemingly insignificant appliances. For example, a door bell costs Â£6 a year in energy use.