This Heater was removed from a tub that had a catastrofic Water Leak!
Midway 2022 the tub developed a water leak and the owner elected to scrap the tub.
This heater with sensors and pressure switch was installed on the tub 12/07/21
with a United spas referb package.
See Pictore of tag put on Heater Assembaly showing Date of Installation.
I am told the tub got very little use.
This unit is ready to go back into service. 
Heater element has been electricaly checked and is Perfect.
This is a real steal if you are looking for a 5.0 kW 15 inch tube assembaly.