Pentair MasterTemp® 461021 Digital IID Heavy-Duty High Performance Natural Gas Low NOx Pool and Spa Heater with Cupro Nickel Tubing 400K ASME HD BTU. MasterTemp® heaters offer all the efficiency, convenience and reliability features you want in a pool heater, plus a lot more. As easy to use as your home heating system, plus, user-friendly indicator lights make system operation and monitoring a snap. The compact design and super quiet operation wont intrude on your poolside leisure time. Heavy-duty (HD) unit with cupro-nickel exchanger stands up to the harshest of applications, like low pH, high flow or heavy use.

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