My ground water was 80° today. Knocked 12 gallons down to 90° in fifteen minutes using 9 gallons of tap, 9 gallons cooled in the ferm fridge to 40, and 10 lbs of ice. That's recirc on both the chiller and the kettle. Without my pumps, brewing would be near impossible on my balcony.
Another 15 and I am at 75°