A boiler or instantaneous water heater is an electric device for the production of hot water. The instantaneous water heater, in contrast to a boiler, heats the water only when streaming through the device whereas a boiler preheats a limited amount of water and keeps it inside a storage tank.
The alternating electric and magnetic fields at the fundamental frequency of 50 Hz resp. 60 Hz are caused by the heating process of the water.
| Measurand | Value | Feature | Remarks |
|---|---|---|---|
| magnetic flux density | 0.05–0.2 µT (measured) | - | measurements of five different boilers at a distance of 40 cm [1] |
| magnetic flux density | 0.1–0.4 µT (measured) | - | measurements of five different boilers at a distance of 30 cm [1] |
| magnetic flux density | 0.12–0.8 µT (measured) | - | measurements of five different boilers at a distance of 20 cm [1] |
| magnetic flux density | 0.4–1.2 µT (measured) | - | measurements of five different boilers at a distance of 10 cm [1] |
| electric field strength | 260 V/m (maximum) | - | at a distance of 30 cm [2] |
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