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A Calorifier (or water heater) is an efficient method of heating water on your boat, as it utilises the surplus heat from your engine's cooling system . As a secondary heat source, the calorifier is also fitted with a dual (220V or 110V) immersion heating element for when you're connected to the mains or a generator. ATI calorifiers are designed for use on sea-going yachts and inland watercraft of all sizes and they can also be used for mobile home and domestic applications. ATI is a long-established Italian manufacturer with an excellent reputation for build quality. Penguin is their UK distributor for and we are proud to offer a comprehensive spares service.