Electric shower

An electric shower or electric shower head are self-heating shower heads that use an immersion heater which is turned on with the flow of water. A group of separate electric heating elements can be switched to offer different heating levels or with an electronic temperature control (using hi-power dimmer). They are specialized point-of-use tankless water heaters and are widely used in some countries such as Brazil and to a lesser extent in Central America. In some countries such as the UK, Malaysia and the Philippines, a tankless electric heater can be placed directly in the shower wall. Invented in Brazil by Francisco Canhos in the 1930s due to a lack of central gas distribution and used frequently since the 1940s, the electric shower is a home appliance often seen in South and Central American countries due to the higher costs of gas distribution, combined with households that in most cases do not support conventional water heaters, as they do not have dedicated hot water piping. Earlier models were made of chromed copper or brass, which were expensive and carried an electric shock risk due to the metallic exterior, but since 1970, units made of injected plastics are popular due to low prices similar to that of a hair dryer. Electric showers have a simple electric system, working like a coffee maker, but with a larger water flow. A pressure switch turns on the device when enough water flows through it, pressurizing the interior. Once the water is stopped, the device turns off automatically. An ordinary electric shower often but not always has three heat settings: high for winter (5.5 kW), low for summer (2.5 kW), or cold (0 W) to use when a central heater system is available or in hot seasons. Higher power (up to 7.5 KW) and lower...