Mirabelle MIRPRESSHTR 12.5 AMP In-Line Heater - For Use with Whirlpool and Total Massage Tubs In-line heater - for use with Mirabelle whirlpool and total massage tubs Heat master - HydroQuip heater provides maximum comfort Required Voltage: 120V Heater Running AMPS: 12.5 Heater Hertz: 60