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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 furnace can also use a significant amount of electricity, mostly to power the fan motor that moves air through your house. Variable speed fan motors are generally more efficient than standard (“PSC”) motors. If you intend to run the furnace fan continuously to filter house air, an efficient (variable speed) motor may save hundreds of dollars per year, because conventional fans are very inefficient at low speed (It is bad practice to operate the fan continuously in air conditioning mode, as it will greatly reduce the ability of the unit to dehumidify the air).