I once stayed in the "guest house" during a visit to my rich uncle in SAT,
my bathroom had one of those instant heaters under the sink..
I got up all groggy, real early in the morning, turned on the tap and quickly
tossed a big double handful of scalding hot water into my face!
WOW, boiling water sure has a way of waking you right up!!
Anyways, isn't the water sitting inside the pipes in Austin already about 70 to 86 deg F??
When I was a kid in Del Rio, we would run about a gallon of warm water down
the drain before getting a glass of slightly cool water.
Here, the 'Hot' water out of our kitchen sink tap feels like it just came out of
the refrigerator water bottle.. It slowly warms up after about a gallon..
I never should have used that extra 3/4" copper to replace the old 1/2" stuff..