Pentair MasterTemp Natural Gas Pool Heater, 400,000 BTU, ASME | 461021 Rectangular Fireplace Pool professionals rely on Hayward

Pool professionals rely on Hayward products for consistent performance and service support

Installation requires access to the heater control compartment and proper routing of wiring

Their wedge and fastener components support long-term serviceability

Safe & Compliant: Meets fire code restrictions for flame-free grilling in multi-unit residences

Pentair MasterTemp Natural Gas Pool Heater, 400,000 BTU, ASME | 461021 Rectangular Fireplace Pool professionals rely on HaywardWhat This Part Is Used For The Pentair 461021 MasterTemp Natural Gas Heater 400,000 BTU, ASME is designed to heat large pools and spas efficiently. It connects to natural gas and complies with ASME standards. Why This Part Matters High output heating reduces downtime between swim sessions. ASME certification supports code compliance in commercial installations. Proper heating equipment prevents inconsistent water temperature and system strain. Key