Presumably the 30 gallon tank you mention is the hot water storage cylinder (copper). A 30.8 gal cylinder is 530 mm in diameter and 1130 mm high (including a layer of factory applied insulation).
(1) If the cylinder doesn't have insulation on it already, get a lagging jacket!
(2) How is your water being heated? - (a) electric immersion heater only (b) indirect cylinder with coil connected to heating system or (a) and (b).
(3) Hair dressing - typical usage is 10 litres (hot water) per shampoo.
(4) Recommended storage is 30 Litres per person for a domestic situation with one bath and 45 L /person if there is more than one bath.
Storage volume and heat input have to be considered together. If you have a small storage volume, it means that cold water has to be heated to say around 65C, in a much shorter time. this requires more kilowatts of heat input - i.e. a bigger boiler.
JD
March 2008
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