The Calesco solid state comfort waterbed heater system with the full 4 year warranty. Our series 100 unit works the same as everyone else's standard comfort system, only better. 325 watts. The difference is that we check every unit before it's shipped. We subject each one to more than twelve times the normal voltage in our 1500-volt insulation breakdown test. And we make sure it's calibrated to give you precisely the temperature you dial. The series 100 comes with an unbreakable control knob, a tamper proof housing, a durable heater pad that's fully grounded and insulated, and most important of all, the MYWATERBEDSHOP stamp of approval.