insulating water heater

hi there.i have a 100L electric water heater (similar to
http://www.celloelectricals.com/gifs/cello-geyser-4.jpg ) in my yard which i was thinking of insulating by wrapping it in fibreglass wool insulation and spraying evo-stick foam in the gaps. the idea is to cut down on heat losses.
then i started thinking....does the majority of heat escape through the walls which i will be trying to insulate? or does it escape through the hot water piping which i cant really stop happening?
Sam
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The majority goes through the walls. However, a significant amount will be lost through the pipes, which should be lagged (insulated) for some distance from the heater with foam. About 60cm/2 foot should do it. (There's no harm in lagging more). The lagging will also make the pipework more resistant to freezing.
Christian.
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distance
Looking at the building regulations, it is suggested that you insulate for 1 metre from the vessel, or until it becomes concealed in the building fabric.
Christian.
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Can not stopheat loss 100% why not lag hot water pipes as well
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