A power shower destroys the thermocline of a hot water cylinder

Assuming the hot water cylinder contains 210 litres of water at 65 degrees centigrade a 5 minute shower uses 60 litres of water which is 40 litres of hot mixed with 20 litres of cold. The 210 litre tank has 40 litres of cold water mixed with 170 litres of hot remaining (55 degrees centigrade). A second 60 litre shower uses 50 litres of hot mixed with 10 litres of cold. The 210 litre tank has 50 litres of cold water mixed with 160 litres of hot remaining ( 45 degrees centigrade).The final 3rd shower is 60 litres at 40 degrees centigrade.

A maximum of 3 showers using 180 litres of water because the thermocline was destroyed.

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This compares badly with a the 10 perfect showers achieved with a showerpowerbooster (20 litres of hot water mixed with 10 litres of cold). 10.5 showers

A maximum of 10 showers using 300 litres of water because the thermocline was perfectly preserved.