This Review Title is Unfortunately the Balboa heater is poorly designed and the sensors go bad every 1-2 years and the content is: Decent & inexpensive sensors. I used these to replace the heat sensors on my Balboa spa unit. Unfortunately the Balboa heater is poorly designed and the sensors go bad every 1-2 years. They're cheap enough that replacing them is no big deal though - just inconveniencing..There are other information for this review, one is This reviewer did purchase it and the other is 3 people think this review is helpful.