The Pentair MasterTemp ASME HD 400 (part number 461021) is a heavy-duty 400,000 BTU natural gas heater for commercial pools, aquatic facilities and premium residential installations. It combines an ASME-certified copper-nickel heat exchanger with a fully enclosed, weather-resistant cabinet for long service in high-use environments.
Key Features
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400,000 BTU: Fast heating and recovery for large pools and spas.
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ASME-certified heavy-duty build: Meets commercial code requirements for safety and construction.
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Copper-nickel heat exchanger: Greater corrosion resistance than standard copper in harsh or high-use water.
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Hot-surface ignition: Reliable startup without a standing pilot.
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Digital controls: Clear readouts and easy adjustments for operators and technicians.
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Low NOx design: Complies with emissions standards.
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Quiet operation: Engineered to minimize noise at high output.
Specifications
| Brand |
Pentair |
| Part Number |
461021 |
| Product Line |
MasterTemp ASME HD |
| BTU |
400,000 |
| Fuel Type |
Natural Gas |
| Certification |
ASME |
| Heat Exchanger |
Copper-nickel |
Before You Order
This model runs on natural gas only; propane versions use different part numbers. Confirm your facility code requirements, venting, clearances and gas line sizing, and have a licensed professional install it. Questions? Call 855-677-7796 or contact us with your model and part number.
Shipping Box Dimensions
36 x 25 x 30 in
Dimensions refer to the shipping carton.
