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Boiler and instantaneous water heater

Belongs to:
Heating systems
Synonyms:
Boiler, Domestic hot water tank, Flow heater, Hot-water apparatus, Storage water heater, Water boiler
Description:

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.

Frequency ranges:
  • 50–60 Hz
Type of field:
electric and magnetic

Measurements (acc. to literature)

boiler
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]

References

  1. Schweizer Bundesamt für Gesundheit: Messung der Magnetfelder von fünf verschiedenen Boilern
  2. No authors listed (2018): [Radiation and radiation protection]