| Word | Description |
| EF | Energy Factor: the ratio of energy received from the water heater to the total amount of energy delivered to the water heater; the higher the better; determined by U.S. Department of Energy test procedures, or the number of pounds of clothing a dryer can dry with 1 kilowatt- hour of usage. |
| Egg | The ovoid, hard-shelled reproductive body produced by a bird, consisting principally of a yolk and albumen egg white). It is a good source of protein, iron, sulfur and vitamins A, B, D and E but also relatively high in cholesterol |
| Egg white | The common name for the clear liquid (also called the albumen) contained within an egg. It is the cytoplasm of the egg, which until fertilization is a single cell (including the yolk). It consists mainly of about 15% proteins dissolved in water. Its primary natural purpose is to protect the egg yolk and provide additional nutrition for the growth of the embryo, as it is rich in proteins and is of high nutritional value. Unlike the egg yolk, it contains a negligible amount of fat. |
| Egg yolk | The part of an egg which serves as the food source for the developing embryo inside. The egg yolk is suspended in the egg white (known more formally as albumen or ovalbumin) by one or two spiral bands of tissue called the chalazae. As a food, egg yolks are a major source of vitamins and minerals. They contain all of the egg's fat and cholesterol, and almost half of the protein. |
| Energy Star Qualifying Products | Residential water heater product classes that are eligible for Energy Star as of January 1, 2009: gas-storage, gas-tankless, integrated heat pump, gas condensing, and solar. |
| Enriched grains | A term usually applied to flour that, after the milling has stripped it of the germ and the bran and other nutritious elements, has niacin, riboflavin and thiamin added back into it. U.S. law requires that flours not containing wheat germ must have these nutrients replenished. |
| Epiphyte | A plant growing on, but not parasitic on, another plant. Orchids, Spanish moss and Bromeliads are epiphytes. |
| Epiphytic | A plant that grows on another plant upon which it depends for mechanical support but not for nutrients. Also called aerophyte, air plant. |
| Exhaust Vent | Where hot air from the dryer exits the house during the drying cycle |
