In a recent thread on another forum, I posted this about the low-tech water chiller: You can basically copy a keg chiller. 1) Picnic cooler 2) A copper coil placed inside the cooler (such as: http://www.amazon.com/Copper-Immersi...ersion+chiller) 3) Fittings at both ends of the coil Fill the cooler with ice water. The temp of the water coming out of the coil will depend on the flow rate. Run the water slow enough and it'll come out pretty close to freezing. Run it faster for less chilling. You'll need to add ice every so often. Instead of adding ice cubes use plastic bottles full of water that you freeze. Easy to replace when they've melted and they can then go back into the freezer to refreeze. The question at this time is: Can this work backwards, i.e., can the ice be replaced by say, an aquarium heater, and the water warmed up a bit? We have had a very cold December here in Norte Tejas, and currently, the ground water is coming out at 50F or lower. I would love to get it up to at least 60F for print washing. What does the collective think?