Bare wire heating element - how it works
The live heating conductors are located directly in the water being heated. The bare wire heater spirals are set into an insulating block that is encased by a pressure-tested cylinder.
Pipes in the insulating block house the heater spirals. The insulation resistance is assured by pre- and post-ballasts. The insulation resistance depends in part on the properties of the water flowing through. To ensure safe operation, the electrical resistance or conductivity of the water at the place of installation must be takeninto consideration.
Bare wire heating elements are also especially suitable for use in hard water. The very small amount of water inside the appliance and the low-mass heating system mean there is hardly any post-heating after the appliance has been switched off – a major reason for the reduction in scale build-up