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I've got a 26 gallon water/oil jacket boiler with heating elements in the jacket.
I'm interested on what y'all would recommend for insulating the outside of the unit as I would like to reduce the transmission of heat outwards. Right now I care about how it works and not as much about looks, though if I have a choice less-kludgy-the-better.
My temps will be able to get hotter than the boiler by a significant amount as I don't want a super long heat-up time, so non-melting insulation is required.