Renovator LATENT GEYSER Energy usage
The power consumption of electric showers in the maximum heating setting is about 5.5 kW for 120 V and 7.5 kW for 220 V. The lower costs with electric showers compared to the higher costs with boilers is due to the time of use: an electric shower uses energy only while the water flows, while a boiler works many times a day to keep a quantity of standing water hot for use throughout the day and night. Moreover, the transfer of electric energy to the water in an electric shower head is very efficient, approaching 100%. Therefore, electric showers may save energy compared to gas or electric central heaters. A 20-minute bath by an electric shower can cost about 1-2 INR, but the same bath using water from a gas heater can cost three times as much. This difference can be larger where the electricity is cheaper than the gas supply, or in tropical countries where the maximum power consumption is required only during the cold seasons.
There is a wide range of electric showers, with various types of heating controls. The heating element of an electric shower is typically a coiled nichrome resistance wire immersed in the water stream. In better versions the heating element may be sheathed and electrically isolated, like the ones used in oil heaters, radiators or clothes irons, providing more safety. Due to electrical safety standards, modern electric showers are made of plastic instead of using metallic casings like in the past. As an electrical appliance that uses more electric current than a washer or a dryer, an electric shower installation requires careful planning, and generally is intended to be wired directly from the electrical distribution box with a dedicated circuit breaker and ground system. A poorly installed system with old aluminium wires or bad connections may be dangerous, as the wires can overheat or electric current may leak via the water stream through the body of the user to earth.