Many home brewers don’t have the room or desire to set up a three-tiered brewing system. Here is an easy way to eliminate the top tier—the hot liquor tank.
When your brew is in the mash, just bring 5 or more gallons of water to a boil. You’re not using your burner anyway at this time. Once it reaches a boil, pour it into clean keg using a large funnel (for safety). I use 10 gallon kegs, but 5 gallons will work fine also. By the time you have finished re-circulating the wort in your mash tun, the water will have cooled to 175-180 degrees.