Oh ok, I didn't think there was that much of a barrier to the heat getting in, if the tank is still filled with liquid rather than foam its insulating quality in the tank could be minimal and keeping the tanks in boiling water could make a little bit of a difference. If you can get it all out of the tanks through a summer heat soak and shaking the tanks then I suppose my concern about it doesn't really exist so much. Thanks for clarifying.
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