Dual-voltage automatic coffee brewer brews 3.8 to 7.5 (14.4 to 28.4 litres) gallons of perfect coffee per hour. model with 2 top warmers is space-saving 8.5″ (21.6 cm) wide. all stainless steel construction. hot water faucet and pourover feature on all models. splashgard funnel deflects hot liquids away from the hand. electrical: if wired for 120v, requires 2-wires plus ground service rated 120v, single phase, 60 hz.if wired for 120/208v or 120/240v, requires 3-wires plus ground service rated 120/208vor 120/240v, single phase, 60 hz plumbing: 20-90 psi (138-621 kpa). Machine supplied with 1/4″ male flare fitting other: based upon incoming water temp of 60f (140f rise) per 1/2 gallon brew time of 4 minutes.