Arctic Spas® Tru-Guard™ heater uses the latest heating technology to maximize the efficiency and reliability for your peace of mind. The Tru-Guard™ heater is sealed with the same protective Teflon-Titanium based coating used to seal commercial acid tanks. This patented coating prevents the build-up of minerals and shields against element corrosion. The Tru-Guard™ heater comes with a five-year warranty...your guarantee that your spa will always be hot!