The standard comfort system with the full 4 year warranty. Our series 100 unit works the same as everyone else's standard comfort system, only better. The Thermal guardian differance 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 Halcyon stamp of approval. Safety thermostat Magnetic field free Easy to read illuminated temperature setting Strong, durable housing Tamper proof sealing Durable waterproof vinyl casing Includes pad and control For use with hardside (wood frame) waterbeds FREE SHIPPING Thermal guardian$59.95 Need help? Feel free to contact us toll free at 1-800-630-5889, or email us at info@expresswaterbeds.com and a customer service representative will be pleased to assist you. Softside Waterbeds | Waterbed Mattresses | Waterbed Heaters Waterbed Sheets | Accessories | Air Beds | Express Waterbeds Home