A water boiler, also known as a hot liquor tank, is a large vessel used to heat water to the desired temperature for use in the brewing process. The hot water is used for a variety of purposes, such as mashing, sparging, and cleaning. The size of the water boiler will depend on the size of the brewing setup and the amount of beer being brewed.
The water boiler is typically the second vessel in a three-vessel brewing system, with the other vessels being the mash tun and the boil kettle. The water boiler is filled with water and heated to the desired temperature using either electricity, gas, or steam.
The temperature of the water is critical to the brewing process. During the mashing process, the water is mixed with the malted grains to create a mash. The temperature of the water affects the enzymes in the malted grains, which in turn affects the flavour and alcohol content of the beer.
The temperature of the water is also important during the sparging process. During sparging, the hot water is used to rinse the sugars from the grain bed. The temperature of the water affects the efficiency of the sparge and the amount of sugar that is extracted from the grains.
In addition to its role in the brewing process, the water boiler also plays an important role in cleaning and sanitising the brewing equipment. The hot water can be used to clean the mash tun, boil kettle, and other equipment before and after each use.
When using a water boiler, it is important to monitor the temperature of the water using a thermometer. A digital thermometer is recommended for greater accuracy. It is also important to ensure that the water is properly sanitised before use to prevent contamination of the beer.