Trub or hot trub is the excess material left in the boil kettle after the wort has been transferred. Boil kettle trub typically consists of hop matter, grain fiber, tannins, and the dense proteins known as the hot break that combine during the first 15 minutes of the boil, and ultimately drop to the bottom of the kettle. It is recommended that the trub not be transferred to the fermenter, as it may impart off flavors on the finished beer.
The trub that was left over in the boil kettle after the boil took place and the wort was transferred into fermenters.
A home brewing sculpture is another term for a home brewery. Most home brewing beer sculptures consist of a hot liquor tank, mash tun, and a boil kettle. The brewing sculpture shown below is a single-tier sculpture that utilizes pumps to transfer liquid from one tank to another at different stages of the brewing process. Each tank has a separate propane fueled burner beneath it to apply heat when needed.
If you are interested in purchasing a prefabricated home brewing sculpture, there are a wide variety of beautiful stainless steel single-tier and multi-tier models available here:
The hot liquor tank or HLT is a brewing vessel used to heat water for different stages of the brewing process, including the mash and sparge. The hot liquor tank is typically heated by either gas, steam, or an electric heating coil. Depending on brewery configuration, the hot liquor tank may hold water at temperatures as high as 170° F or possibly even higher in cases where a boil is conducted to modify the mineral composition of the brewing water in order to remove bicarbonate
The photo below is the brewing configuration that I use. The hot liquor tank is the rightmost kettle, and I utilize a march pump to transfer the heated water to the mash tun at different times in the brewing process. Additionally, at the end of the boil I fill the hot liquor tank with ice and cold water and pump the cooled water through the counter flow wort chiller to cool the wort more quickly.