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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.
Hot
water usage varies with the type of building, it uses and the number of
occupants. Occupant usage may vary depending on their level of activity, age,
and water usage by appliances etc.
In modern
homes hot water usage can vary between 35 and 45 litres per person per day, with
hot water at between 60 - 65 degrees centigrade.