I just started growin indoors..i been farming outside for 40 years.,.,my Son has 3 UC systems and i was impressed by it ..so I built one.,.came out great..,.it is only a 6 bucket system ..13 gallons.,.,any ways i wanted a chiller and did lots of research.,.,I ended up with the Coralife 1/4 chiller made for saltwater fish tanks..it has a titanium coil so it will not corrode..,.some of the cheaper hydro chillers have a copper coil so I did not like that..,.it also has a heater in it..my well water comes out at 51 degrees..it heats it to my 65 degree target and then chills when needed...very quiet..hardly any heat from it..I timed the chill cycle...when my water hits 67 it comes on...gets to target temp in 10 minutes...65...it comes on about every 5 hours..during light cycle...hardly ever during dark period...