There are details on all of the main main types of shower:
This site has had a major upgrade and there are now many more pages available with a lot more information on venturi showers - click the following button to find out more:
High pressure mains cold water is used to "suck" tank pressure hot water through the special venturi valve inside the unit, so that the resulting mixed water comes out at a much greater rate than could be achieved using an electric shower or ordinary shower mixer valve.The venturi shower uses no electrical connections, it simply plumbs straight into the heating system. There must be a 300mm gap between the top of the shower head and the bottom of the supply tank (see our updated venturi shower page for details).
Venturi showers will not operate with high pressure hot water systems such as combination boilers or unvented systems.
Venturi showers will only work where there is low pressure, tank-fed hot water and high pressure, mains-fed cold water - an arrangement which is commonly found in UK homes.
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