Background Primary product used in this scheme was the Challis Water Widget® which is a shower aerator using the Venturi Effect; this means that when water flows through a pipe the pressure changes depending on the diameter of the pipe, so if you change the diameter you change the pressure. This means that by putting a small hole in a device with a step change in diameter you can suck in air which mixes turbulently with water, resulting in a volumised flow from the shower head which uses less water but has the same pressure and feel as before. The Water Widget® is unique in that it has been designed to be reversible so it fits on both fixed head and hose showers. Heating water in the home is responsible for about 5% of UK CO2 emissions and showering is the fastest growing use o

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