On of the most popular high efficiency mash tun design is the 5 gallon Igloo cooler.
This cooler can be picked up at almost any hardware store for around $25, and a 10
gallon for around $40. A 10 gallon mash tun should be used for 10 gallon batches or
high gravity 5 gallon batches.
The design of these coolers holds heat extremely well, and adapting a manifold is quite easy. The 5 gallon design can hold up to 12 pounds of grain, which can get you a wort around 1.065. Read more…