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I did mine but also using a recirculation pump, insulating the first five or ten feet out of the tank is probably the most beneficial, trying to keep the heat in the tank, pretty low r value in the foam.
Should verify the water temp in your tank and make sure it stays above 55c or 132f, From what I have read any lower and there is a risk of bacteria that causes Legionnaires disease.
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87 930,
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