Bunn-O-Matic RT-35

The BUNN-O-Matic RT 35 (often referred to as part of the CWT/RT series) is a high-volume, automatic commercial coffee brewer designed for diners, restaurants, and cafes, capable of brewing up to 7.5 gallons per hour. It features stainless steel construction, a 5-warmer design (3 lower, 2 upper or 5 lower depending on specific model) to keep coffee hot, and SplashGard® to protect users. 
Arco Coffee +4
Key Features and Specifications:
Capacity: Brews up to 7.5 gallons ( liters) of coffee per hour.
Design: Durable stainless steel construction with a space-saving, narrow design.
Warmers: Typically equipped with 5 separately controlled warmer plates (5 lower).
Automation: Automatic water connection allows for consistent, plumbed-in brewing.
Safety & Convenience: Includes SplashGard® to protect users from hot liquids.
Electrical: Generally requires 120/240V, 19-20 amps, around 4050-4600 watts. 
Arco Coffee +4
This unit is frequently listed as a robust, "old-school" diner-style machine often found refurbished.