The water heater (electric element or open flame) heats the water in the tank making it a hot water tank. Some old plumbers also call it a boiler, even though it doesn't boil water. Does that clear things up? 
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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