Pentair MasterTemp HD ASME Pool Heater 461021 – 400K BTU Natural Gas, High-Performance & Energy Efficient

The Pentair MasterTemp HD ASME Pool Heater 461021 delivers 400,000 BTU of powerful, reliable heating with built-in ASME certification for high-performance applications. Designed to meet rigorous commercial and residential standards, this natural gas heater blends robust construction, efficient heat transfer, and advanced control features to extend your swimming season with consistent warmth.

Featuring a high‑efficiency heat exchanger, electronic ignition, and intuitive digital controls, the MasterTemp HD ASME model provides fast warm‑up times, optimized fuel use, and dependable operation even under demanding conditions. Its ASME‑rated design ensures enhanced safety and durability, making it ideal for larger pools, heavy use, or installations requiring certified compliance.

Pentair MasterTemp HD ASME Pool Heater 461021 Compatibility

• Designed for natural gas pool heating systems.

• Fits 2” plumbing connections common in both residential and commercial pools.

• Compatible with Pentair automation systems including IntelliCenter®, EasyTouch®, and IntelliTouch®.

• Ideal as a replacement for older ASME‑rated or high‑capacity pool heaters.

• Works with standard pool circulation and variable‑speed pump systems.