125USG Natural Gas 500,000Btu Condensing, High Altitude Commercial Gas Water Heater GHE125-500A HA

All models vent with standard 4" or 6"diameter PVC plastic pipe. Super Duty units can be installed with Power Vent or Power Direct Vent configurations. | Factory installed relief valve. | It can be installed as a power-vented product; or as a power direct-vented product when negative air pressure is an issue or if indoor air quality is a concern. | Energy saving ignition system for smooth, easy light offs. | Standard models are certified up to 2,000 feet; high altitude models available up to 7,800 feet. | Latest models have increased burner surface area for ultra smooth ignition and quiet operation. | Hot and cold water Inlets and outlets on both sides of the unit; 2" NPT high-flow connections. | The helical-fin three stage heat exchanger is engineered to optimize heat transfer by increasing surface area, thereby increasing heat transfer and efficiency. These products are built to last. | Factory installed brass drain valve allows for draining and servicing. | The new LCD user interface is standard on all Super Duty models. It enables installers and service technicians to monitor key functions and components. It includes a scrollable, operational history. | The Super Duty models offer magnesium anode rods to protect the tank and heat exchanger from condensation and corrosion.