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The energy efficiency of water heaters is described by an energy factor, which is a ratio of heating output to energy input. Only heat pumps can achieve an energy factor above 1, since they use an inverse refrigeration cycle to capture ambient heat. In all other hot water systems, the heat input comes directly from the energy source used.
When comparing water heaters, the operating cost depends on both the energy factor and the heat source. Electric resistance heaters have an EF of nearly 1.0, while gas heaters are typically below 0.8 EF. However, resistance heaters cost more to operate, since one kilowatt-hour of electricity is much more expensive than the equivalent 3,412 BTU of natural gas.A backflow preventer can be described as a large check valve, which prevents backflow from a building into the local water supply. Normally, the water supply has a higher pressure and backflow is not possible. However, backflow can become an issue when areas are flooded, and also when the supply pressure drops due to a system malfunction. With a backflow preventer, water that has already reached a building cannot return to the local supply, preventing contamination.
A grease trap is used to prevent the discharge of oils and fats into the sewer system. When these substances are discharged without control, they can block sewer pipes and cause spillage. This is a major health hazard that must be avoided at all costs, and grease traps capture the substances that cause these issues. Grease traps are normally needed in commercial kitchens, and other applications where fats and oils are released in large amounts.