This is the 4KW PDR heater, built without a pressure switch. Please note that if your spa was designed to use the heater with a pressure switch, you can still use this heater, but you will also have to apply a jumper on connector P34 on the IQ2020 main board. This heater is designed for the following models. The item “73791 Hot Spring Spas No Fault Heater 4 kW Watkins HotSpring” is in sale since Thursday, August 30, 2018. This item is in the category “Home & Garden\Yard, Garden & Outdoor Living\Pools & Spas\Spas & Hot Tubs”. The seller is “zdmap” and is located in Long Beach, California. This item can be shipped worldwide.
