Balboa Flow Thru Spa Heater Assembly with Sensor & Pressure Switch, 4KW, 15 inch, for LE Systems - fits Jacuzzi R574 & R576

Also compatible with any Balboa spa control system that uses the following part numbers :

52221-03, 52221-04, 52221-05, 52296-02, 52296-03, 52296-04, 52296-05, 52526, 52866-03