Ya off the hot water heater, and plumbed to a tap line if you want cooling.
My tank isnt wet yet, still building, but the next piece, after I finish the qt's and mixing station, is the the temp control system. I'm shooting to keep my tank around 74 in the summer and 72'ish in the winter, as it will be mostly deeper water stuff. Im making 2 coils, one for heating and one for cooling.
Heating one is hooked to hot water heater and circulated via a hot water pump and controlled by a ranco, with apex in backup. The cold water will be hooked to cold tap, with output hooked to my yard drip system, to water my yard when the tank gets cooled in the summer. ranco to control and sprinkler valves for the solenoids.
My basement runs about 5 degree cooler the house temp on average which in summer is 73 most of the time. In the winter its about 68 in the room, so should be just about perfect for mine