this review title is: unfortunately the balboa heater is poorly designed and the sensors go bad every 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 years they are 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.