I see a lot of people with the 3 tier brewing system. What is the benefit and What are the different levels for? This system is what I am referencing.
Top tier - Sparge Water
Middle tier - Mash Tun
Bottom Tier - Boil Kettle
The main benefit to having the vessels stacked in this manner is that you can transfer water/wort without the use of a siphon or an electric pump, everything can be gravity fed from top to bottom. Three tiers also allow you to easily fly sparge much easier than other setups (Obviously you can still batch sparge if you choose).