Electric shower
Self-heating shower head invented in Brazil in the 1930s.
Wikipedia / Wikimedia Commons
An electric shower or electric shower head is a self-heating shower head that uses an immersion heater activated by water flow. Invented in Brazil in the 1930s due to a lack of central gas distribution, it became a common home appliance in South and Central America, where households often lack dedicated hot water piping.
- invented
- 1930s
- inventor
- Francisco Canhos
- country_of_origin
- Brazil
- field
- Home appliance
- common_voltage_power
- 5.5 kW at 127 V, 7.5 kW at 220 V
- typical_heat_settings
- High (5.5 kW), Low (2.5 kW), Cold (0 W)
Lore & Background
The electric shower was invented in Brazil by Francisco Canhos in the 1930s due to a lack of central gas distribution. It has been used frequently since the 1940s, particularly in South and Central American countries where gas distribution costs are high and households typically lack 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. Since 1970, units made of injected plastics have become popular due to low prices similar to that of a hair dryer.
Reader's Guide
The electric shower is a specialized point-of-use tankless water heater widely used in Brazil and to a lesser extent in Central America. Its significance lies in providing affordable hot water in regions without central gas distribution or dedicated hot water piping. The device uses a simple electric system, working like a coffee maker but with a larger water flow, and a pressure switch turns it on when enough water flows through. Energy efficiency is high because it heats water only while flowing, avoiding standby losses of tank boilers. Safety concerns have driven the shift from metallic to plastic casings, though poor installation with old aluminum wires or unconnected ground wires can be dangerous, giving rise to the term 'suicide shower.' Modern units often have replaceable nichrome heating elements, with some featuring sheathed, electrically isolated elements marketed as safer but more expensive.
Did You Know?
- The electric shower was invented in Brazil by Francisco Canhos in the 1930s.
- Earlier models were made of chromed copper or brass, which carried an electric shock risk.
- Since 1970, units made of injected plastics have become popular due to low prices.
- An electric shower uses energy only while water flows, unlike tank boilers that lose standby heat.
Frequently Asked Questions
Who invented the electric shower and when?
Francisco Canhos is credited with creating the electric shower in Brazil during the 1930s. It was developed as a practical solution for households that had no access to centralized gas or hot-water systems.
How does an electric shower actually work?
Water flowing through the shower head activates a built-in immersion heater that warms the water on the spot. There is no separate tank or boiler; the heating element engages directly in line with the water flow, making it a fully self-contained unit.
Why was the electric shower invented in Brazil specifically?
Brazil in the 1930s lacked widespread central gas distribution, so most homes had no way to heat water for bathing. Canhos's inline heating design let any household get hot water without installing new piping or connecting to a gas network.
What are the typical power settings and voltages of a Brazilian electric shower?
Most models offer a High setting around 5.5 kW, a Low setting near 2.5 kW, and a Cold setting at 0 W. In terms of supply voltage, units are rated at 5.5 kW for 127 V circuits and 7.5 kW for 220 V circuits.
Where is the electric shower most commonly used today?
It is a standard household fixture across South and Central America, where many homes still lack dedicated hot-water plumbing. Its plug-and-play design makes it far more practical in those regions than a traditional gas or electric water heater.
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