Hayward H2001 H-Series Millivolt Natural Gas Pool Heater, 200,000 BTU. This is a Hayward Forced Draft Millivolt Heater. Features on all Millivolt heaters include rust-resistant water path with polymer header assembly and a rapid-heat combustion chamber. THE LATEST IN HEATING TECHNOLOGY FOR SWIMMING POOLS! 83% thermal efficiency rating. This heater is ruggedly built with a patent-pending heat exchanger design that incorporates a simple header design combined with a unique "V" baffle that allows for longer life, quicker heating and virtually no condensation. The burner system is crafted from tough, durable Eugenox, a proprietary steel alloy and can be removed individually or as a complete unit for easy maintenance and cleaning. There"s a rust-resistant water path through the heater providing an extended life and simple CPVC installation. It features a manual control panel and push-button ignition. NOTE: An Indoor Draft Hood is required for indoor pool heater installations.NOTE: This item cannot be shipped to California. If your shipping address is in California, this item will be removed from your order.