The Raypak Digital Cast Iron Glass-Lined ASME Cupro-Nickel Natural Gas Heater is engineered to last. Looking at the heater, you can see that it's designed different than most heaters on the market. The Raypak 009269 has a unique "pagoda design" to enable the heater to stay effective during high wind speeds and downdrafts. The cabinet of the heater is constructed from a stainless steel, then powder coated with a 7 stage process to outlast the elements and corrosion. Inside the unit, the heater boasts cast iron glass-lined headers and a cupro-nickel fin tube to stand up against harsh pool chemicals and prevent rust stains on you pool's surface.The Raypak Digital Cast Iron Glass-Lined ASME Cupro-Nickel Natural Gas Heater not only lasts long, but is extremely easy to use and operate. The heater has a built-in Microprocessor Controlled Thermostat to set you pool or spa at the perfect temperature with the push of a button. It's also remote compatible and can connect to any two or three wire remote for added convenience. The heater also contains built-in diagnostic controls to alert users or pool professionals of any issues and the location of these issues. In addition, the heater contains built-in electronic ignition. This enables the unit to turn the pilot light off and on when needed, conserving gas usage and saving users money