Limescale absorbs heat and increases the cost of heating water. The Langelier Index shows the amount of energy lost in relation to the thickness of the layer of limescale.
Langelier Index – Summary
A small build-up of limescale will reduce the efficiency resulting in an increase in the cost of energy.
The langelier Index also plots the increase in corrosion that comes with an increase in limescale.
Langelier Index – Corrosion