All those who use a roof-top Solar Water Heater at your residence, what do you do with the cold water that needs to be drained out initially till solar-heated water arrives at the taps?
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Drain it into a bucket/drum & reuse later for other purposes like cleaning floors/cars, gardening, etc.
Reuse it for bathing using 1 or 2 buckets for mixing with solar-heated water
Use an Electrical storage Geyser installed near the tap
Use an Electrical Instant Geyser installed near the tap
Let it go waste into the drain
Use a re-circulation system to pump the cold water back into the overhead tank