We have an instant on demand water heater, so while waiting for the cold water to run out of the pipes, instead of just letting it run, I put my flower watering pots on the counter and fill them until the water gets hot. I've saved energy by not having a water heater running constantly and conserved water by using the cold water for watering plants.
I am interested in installing one of those instant hot water tanks. About how long do you have to wait and about how much water do you get before the water runs hot enough for your purpose?
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