Posts Tagged ‘Hot Water Pressure Washer’

Hot Water Pressure Washers

Tuesday, October 6th, 2009
We often get asked why you need a hot water pressure washer?! Well you need hot water and chemical to completely remove oil and grease and to prevent the oil and grease from reforming elsewhere on whatever you are cleaning. The hot water melts the oil or grease and the chemical emulsifies the oil or grease so that it can be effectively rinsed away.
But I can remove oil and grease with my cold wash and chemical can’t I?

No, you can spread it around a bit and some will wash off but you will never remove the microscopic film of oil left behind unless you wash it with hot water and chemical.

I have heard that you can pump hot water through a cold water pressure washer – I could do that rather than buy a hot water pressure washer can’t I?

Some pressure washers can do this, the Kranzle range of cold water pressure washers and our Demon range can happily pump hot water, provided it is pressure fed into the pump and it is below 60°C. This is better than cold water but not the same as a hot water pressure washer. It is also true that the Demon Storm 1 and 2 can have modified seals fitted to enable water to 80°C to be used. We have made a number of these modified pumps and they are working reliably with the customers who bought them. With a hot water pressure washer cold water only flows through the pump. It is then heated by a very hot flame burning either diesel or kerosene via a heating coil to heat the water. This water leaves the machine at about 90°C to 95°C.

Check out our range of hot water pressure washers at:

http://www.demon-pressure-washers.co.uk/acatalog/Electric_Hot_Water_Pressure_Washer.html

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The water is not as hot as it used to be – Why

Wednesday, August 26th, 2009

The fuel nozzle in your hot water pressure washer is a wearing item. It needs to be changed regularly. When you change it depends entirely on the quality of fuel passing through it. As the nozzle wears the droplets which are atomised become bigger until they will no longer ignite easily. The symptom of this is flames appearing up the chimney. As soon as the flames are visible half way up the square section, change your nozzle and your filter, as well as removing the fuel tank and draining out the sediment and water that will have accumulated.

Another reason for the water not getting as hot it used to, is a damaged cone. If you strip a fuel nozzle you will find that there are three very small grooves that the fuel travels along before it leaves the nozzle.

Dirt can block one of these grooves which forces most of the fuel out of one side causing a lopsided flame, which will in time oxidise the metal causing it to flake and drop into the bottom of the coil. The flame will burn mostly on one side of the boiler and even heating of the coil will not occur leading to a loss of heat output. Other symptoms include a hot outer casing and a partially melted fuel tank.

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