The Hydro-Quip PH101-15UP Pure Heat 1-1/2" In-Line Compact 1.5kW Whirlpool In-Line Bath Heater is an optimal replacement heater for whirlpool baths. The PH101-15UP comes in a versatile, compact size with a convenient 120V 3' corded plug and 1.5kw. Its automatic smart thermostat monitors temperature for an easy-to-use and adaptable heating system, and its in-line configuration supports sturdy pipe connection. The Hydro-Quip Pure Heat Bath Heater's reversible mounting gets rid of direction-oriented installation; both sides can be installed into any standard intake and outtake valve, adapting to 3/4 to 1-1/2" PVC plumbing.