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  • I have some of this aluminium-backed foam stuff. If I was going to wrap a water heater with it, which side would face outwards?

  • Is it only aluminium backed on one side?

    Generally I think the aluminium is there as a reflector so I'd put it on the side you want the heat to stay.

  • Yes

    That's what I thought but all the photos I've found have it the other way around.

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