The Pentair ETi High-Efficiency Natural Gas Heaters (250K & 400K) represent the pinnacle of pool heating technology. Featuring a TitanTough™ Direct-Fire Titanium Heat Exchanger, these units are built to withstand the harshest saltwater and chemical environments. With an industry-leading 96% thermal efficiency rating, they deliver faster heat-up times and significant fuel savings, making them the most cost-effective and durable natural gas heaters available for modern pools and spas.

Key Features

• Titanium Heat Exchanger: Pure titanium construction offers unmatched corrosion resistance and a longer service life.
• Maximum Energy Efficiency: Up to 96% thermal efficiency ensures nearly every BTU of natural gas goes directly into the water.
• Fast Heat-Up Times: High-performance burners get your pool or spa to the perfect temperature in record time.
• Flexible Installation: Features a rotatable front door and versatile plumbing for easy "drop-in" replacement of MasterTemp heaters.
• Ultra-Quiet Operation: Sophisticated design minimizes noise to maintain a peaceful backyard environment.
• Category IV Venting: Certified for PVC exhaust venting, allowing for long runs and flexible indoor or outdoor placement.