Watlow BLN Type 12 KiloWatt Immersion Heater * 480 Volts * 12 kW power * Model BLN732G5SMS * Two identical units * Includes one Glo Quarts digital temperature controller if you buy both. If you buy one heater, the controller is an extra $200. * 2.5" Diameter Screw in type heaters. * PRICE IS EACH! Buy both and Glo Quarts is included if you want it.