This 26-55691-K Heater Assembly is designed for the Revolution. Balboa’s Revolution hot tub control is setting a new industry standard for unmatched system reliability, manufacturing flexibility and end user friendliness. Utilizing advanced technology and high temperature corrosion proof mission critical materials from the automotive and other industries, the Revolution hot tub control systems all but eliminate leaks due to corrosion or harsh chemicals. Together with a newly designed, energy efficient heating coil that reduces element failures due to rattling, Balboa is providing peace of mind for the end-user.