Thanks mate. I just ordered a 6m roll of the first one I listed.ajfoxy wrote:No, use the insulation you first listed. It handles up to 650deg C. If you want to you can paint the inside of the steel sheet. Some paint will come away when you weld though. And unless you are right on the coast they should last for many years. Worst case you might have to re-skin it in ten years if you are living in a highly corrosive area. If you are up in Joburg you will be fine. It would take around 100 years to rust.
Don't take short cuts with the insulation and gaskets and you will have a great unit.