Geyser blanket for outside geyser?

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Our geyser popped last year - it was in a cupboard and apparently they don't make that size any-more - we have a flat roof - so inside the roof wasn't an option so we opted to have it installed on a side wall - now that its winter this thing is eating electricity.

Anyone know if you get geyser insulation for outside? Everything I've seen is meant for inside geysers?

 

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