Here's a point I read awhile back that I thought I'd share:
Have you ever rinsed something, or washed your hands so quickly that even though your tap was set for warm or hot water, the hot water didn't have a chance to travel through the pipes before you turned the water off?
Essentially you ended up using cold anyway - no big deal. But unless you had the tap set for cold (in our case, pushed all the way to the right), there was still water taken from the hot water tank and drawn into the pipes. This means that more water will have to be heated to replace it.
It's such a small amount (not even pennies?) each time, until you consider adding up every single time the tap is turned on and off (on and off, on and off).
If the still cold water that comes out of the tap is fine for what you need, why take it from the hot water tank?
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