Hard water

Boiler manufacturers will not cover limescale build up in their boilers, if the boiler scales up this could become costly for you and result in the boiler warranty being stopped.

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There is a huge range of different products that offer scale protection. 

Magnetic, electrolytic, electronic, polyphosphate, and water softeners.

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You need to know the hardness in the area you live in, you should be asking the installer for the correct scale reducer for the area you are living in. 

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Scale can vary hugely from area to area, even in just a few miles. 

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you can check your area here

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There are different types of scale reducer for different levels of scale. 

it would always be best to fit a water softener.