Re: wall thickness
It depends on the insulation used, if any. With some of the ceramics, wall thickness can be 1/4" with a 1000 degree oven and you can still stick your bubble gum to the outside wall. Price = Performance when it comes to insulation.
Most new home heaters and water heaters are rated "Zero Clearance". This means that the outside wall will not cause ignition of building materials. That doesn't mean you can put your hand on it though. (Although some meet that test.)
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