Safe. Waterproof, acid & alkali resistant, anti-corros ion & anti tensile,self-limit temp. 55 Healthy.Far infrared heating promotes blood circ ulation, improves human immunity. Comfort.76% Radiation + 23% convection.All room heating evenly, equally and mildly. Saving. 30% power saving .99% heat efficiency, 76 % thermal radiation effiency,heating up in 10 secon ds. Green.No noise, No greenhouse gas emissions,No n toxic and pollution-free. Low cost, no construciton cost, low maintenance co st. Electrodes are welded and waterproofed in advanc e to avoid brake and leakage during installation. Suit for: under cement floor or under tile floor