Reed switches in Instant Water heaters and Power showers
Bathrooms appliances such as Instant Water Heaters and power showers use reed switch based Flow switches to detect if the water supply has been turned on. As soon as the shower is turned on, the flow switch detects this and this signal is used to activate a relay that controls the high power instant heater.
Some models also use this signal to turn on a pressure pump to increase the water flow rate. In addition to switching on the heaters, thermal reed switches are used cut in and cut out the multiple heaters that heat the water as it is pumped through. This is to ensure that the heat of the water is matched to the flow rate set, as a higher flow rate would require more heaters to be turned on.
When the shower is turned off, the flow switch will senses this and turns the heaters and the pressure pump off. Such instant heater power showers conserve as much as 40% more energy than conventional tank based heaters or geysers.
Applications are classified as Position Sensing, Pulse Counting, Electromagnetic or Relay, Temperature Sensing or Magnet Biasing types. This application is classified as follows and the link gives more information on best practices to help select the most suitable AT band and matching magnet.
The Reed Switches and Sensors used in such applications need to be robust, durable and efficient in meeting a high life expectancy. Our engineers work hard in life testing our products under various conditions, and our intention is to ensure end product durability and life. Although we wouldn’t want to restrict any of our products for use in only certain applications, the recommended products for use in this application are listed below.
TRS-W Thermal Reed Sensor
TRS-W Thermal Reed Sensor Drawing starFeaturesTemperature range of 25°C to 130°C. Less than 3°C tolerance. Normally Closed
Nov 30, 2020
LV-1925 Reed Switch for Line Voltage switching
The LV-1925 is a Line Voltage Reed Switch is designed for endurance at switching line voltage loads of 230V. Two versions are capable of
Dec 2, 2020