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British standard specification cylinders are currently provided in four grades, with grade one being the superior. Amendments to the specification are currently under consideration and the prospective purchaser may wish to consult the new draft specification. Note in particular that it is proposed to remove grade 4 cylinders from the British specifications.
It is particularly important to ensure that the grade selected is adequate for the working head of the cylinder, (i.e. the distance between the bottom of the cylinder and the level of water in the cold water feed cistern. The better the grade the better the resistance to copper corrosion and the better the longevity of the cylinder. Note the thickness of copper sheet before forming on the chart below, just over half a millimetre in some cases.
A hot water cylinder wrap can reduce that percentage substantially and save up to 10% on your electricity bill!
Many households use the cylinder cupboard for drying clothes in. Because your unwrapped cylinder loses heat every minute, it is more energy-efficient to install a wrap and dry clothes outside or in the dryer for several minutes than it is to lose heat every minute of the year. If you install a wrap and switch to using the dryer two hours a week, you can save up to 2.5 times the energy!