Length x Width x Desired Temperature Rise x 12 = Required BTU. Example (10 x 20 ft. pool; desired temp rise of 20 degrees Fahrenheit): 10 x 20 x 20 x 12 = 48k BTU. When you are deciding what size pool heater to purchase, it is important. to understand that a larger heater will heat the water faster.
Built In Refrigerators. Built in refrigerators are only finished on the front and fit flush with the surrounding cabinetry for a sleek, high-end look. A built in refrigerator is designed to fit into a cabinet depth of 23 1/2 to 26 inches and can be customized with panels to match the overall design and style of your kitchen.
Jacob Perkins, who worked with Evans, received a patent for a vapor-compression cycle using liquid ammonia in 1835, according to History of Refrigeration. For that, he is sometimes called the father of the refrigerator. John Gorrie, an America doctor, also built a machine similar to Evans' design in 1842. Gorrie used his refrigerator, which created ice, to cool down patients with yellow fever in a Florida hospital.