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In fact, the powerful 500,000 BTU model is the fastest in its class, giving you less time to wait and more time in the water  EASY ON THE ENVIRONMENT  Designed with “totally managed” water flow, Universal H-Series heaters save energy (and money) by reducing pump run time. Their low NOx emissions meet air quality standards in all low-NOx areas, so you can rest easy knowing their environmental impact is low The Universal H-Series is an energy efficient, high performance, installation adaptable commitment to the pool service professional.  Standard cupro nickel heat exchanger Can be used at an altitude of up to 10,100 Ft. 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