The element consists of an inner wire surrounded by filler material enclosed in a sheath of copper or stainless steel.
The thermostat allows electrical current to flow through the inner wire, and from the wire's resistance, creates heat, which is transferred through the filler material to the outer sheath and is then absorbed by the water.
Elements may be available in different wattages, and materials, to meet specific heating requirements.once we change the elements we will also change the thermostates.