Description: ProMax brand of water heaters are designed and engineered to reduce your monthly energy bills and serve you through its exceptional reliability. This brand of heaters have the A. O. Smith's patented C3 Technology® design. The C3 technology which is covered by four patents in the US comes with a sealed combustion chamber with an air intake screen and fireproof Cordierite flame arrestor which is built in the heater base. ProMax Power-Vent water heaters is equipped with a flammable vapor sensor which instantly shut down the blower, Intelli-Vent gas control and hot surface ignition once it detects flammable vapors. Features: