Kasakato said:The hard way:
I myself know some internet friends who have givent negtive remarks about thses heaters from Big Als(TM). They are know to be fulty and will sometimes look in the on postion. This can kill your fish very eaisly. It would be best to advoid them because some others have been shocked with 120v AC when they want to adjust their heater. For these reasons it would be a good idea to buy another branad like Tronic, or Jagar.