Heaters fail more often than any other spa component. This is because most spa heaters use a heating element submerged into the water, directly exposing it to the potential hazard of chemical imbalance or poor quality water (a problem usually not covered under warranty.) 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 unconditional replacement warranty...your guarantee that your spa will always be hot!