Pentair – MasterTemp, Low NOx, 400K BTU, Natural Gas, Pool & Spa Heater

The Pentair EC-462028 MasterTemp is built for high-demand heating performance — ideal for large residential pools and spa combinations. With 400,000 BTU of output, this heater rapidly brings water to the perfect temperature while maintaining excellent fuel efficiency. Its Low NOx technology ensures cleaner combustion that meets strict regional air-quality standards.

A compact footprint, digital controls with diagnostics, and rugged construction make this reliable, professional-grade heater a top choice for both new builds and retrofit installations where maximum heating power is needed.

Key Features

• 400K BTU output for fast heating of large pools and spas

• Natural gas operation for consistent, efficient performance

• Certified Low NOx emissions — eco-friendly by design

• Digital LCD controls with real-time system diagnostics

• High thermal efficiency to reduce operating costs

• Compact cabinet design fits tight equipment pads

• Durable weather-resistant enclosure for long-term reliability

• Indoor or outdoor installation (with proper venting)

• Advanced safety systems safeguard heater and equipment

Benefits

• Keeps water warm quickly — even in large applications

• Optimized combustion reduces fuel use and monthly costs

• Simplified operation and serviceability

• Long-lasting performance minimizes maintenance needs

• Compliant with tough air-quality requirements

• Ideal upgrade option for older, inefficient heaters