Therm Products 20-08520 Marquis 12" x 2" Flow Thru 230V 4.0kW Spa Heater With J-Box Dimensions: 12" Length x 2" Diameter Kilowatts: 1.0kW/4.0kW Voltage: 115V/230V Plumbing Connections: 2" Slip x 2" Slip Pressure Tap: 0 Degrees from Terminals