
Originally Posted by
GCE
I was involved in testing geyser efficiency and we ran them leaving geysers off and switch on after a time period leaving geysers on all the time and allowing the thermostat to control them.
It made basically no difference to the electricity usage .
If you use 10 liters of hot water you have to heat 10 liter's of cold water , whether you do it at 12H00 or do it at 8H00 hours there is still the same amount of energy needed to heat it . If you take another 2 liter's whether on or off it is still the same amount of energy to heat 2 liter's independent of whether the geyser is at temperature or below temperature
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