Coffee brewers with portable servers brews 16.3 to 18.9 gallons (61.7 to 71.5 litres) of perfect coffee per hour. brews 1/2, 1, or 1-1/2 gallon (1.9, 3.8 or 5.7 litre) batches. patented server heat control automatically shuts off once target temperature is reached. Can be set to 175″”190f (79.4″”87.8c). electronic grinder interface instructs grinder on exact amount of coffee for selected brew batch size. remote 1 or 2 server docking stations for additional satellite coffee serving. safety-fresh patented brew-through lid with vapor seal and spill prevention. variable batch selector knob lets you brew large batches or small servings. international electrical configurations available. electrical: brewer is 3-wires plus ground service rated 120/208v or 120/240v, single phase, 60hz. Plumbing: 20-90 psi (138-621 kpa). Machine supplied with 1/4″ male fitting. Tank capacity: 8.4 gallons (31.8 l) other: based upon incoming water temp of 60f/15c (140f/60c rise) per 1/2 gallon brew time of 4 minutes.models listed as 120/208v or 120/240v must be connected to 208v or 240v electrical service respectively. Please refer to the installation manual.