Here's a photo of my current setup, the keg on the left is the "hot liquor" (hot water) tank and corresponds to the top tank in your son's setup. A 12 VDC pump moves hot water to the picnic cooler mash tun, the middle tank in your son's setup. Then another pump moves the sweet wort (the sugar extracted from the malt) to the kettle on the right for the boil.

I enjoy seeing other people's brewing setups. LonnieMac is a homebrewer who designed and developed a very nice brewing system. He doesn't post much anymore but maybe he'll see these posts.
<Chas>
