They are not vented to the outdoors, but they usually have at least one removable plug in the lid or side, and some firing procedures involve leaving this out, or in others, leaving the lid slightly open to allow moisture to escape. More sophisticated models have vents which can open and close automatically.
That what I suspected - so, as I said, it's like having five 2kW fan heaters running at full pelt, with the full 10kW worth of heat getting into the room/building one way or another. Even in a garage, I would have thought it would get pretty hot!
Indeed, I eluded to that at some point. However, as I said or implied, unless one could find a 50A fuse (i.e. if one had to use a 60A one), 10mm² cable would have to have virtually no de-rating factors (including ambient temp ones) to be acceptable.
I suppose it could have once been used for much more modest loads, for which a 32A OPD was more than adequate (so it was not thought necessary to have a higher-rated OPD than that), with 10mm² cable installed for 'future-proofing' (maybe even with this kiln in mind!).
An electric kiln can be forcibly vented to the outside, but often isn't. However, the heat is mainly radiant - a kiln is basically a case of firebricks inside a metal skin, with electric elements inside. The interior temperature will rise to between 900 and 1300 C depending on the nature of the firing.
It does, but goodness knows where they got that from. For 10.5kW to equate to only 39.6A would require a voltage of about 265V - well in excess of the maximum permitted UK supply voltage (253V).
Fair enough, but even that's not quite right. As flameport pointed out at the start, for 10.5 kW to equate to 47.7A implies that they are quoting the power at 220V. With 230V (the 'nominal' UK voltage), as specified in this catalogue, 10.5kW would draw 45.65A. Put another way, 47.7A at 230V (which is what the catalogue says) would equate to about 10.97 kW (which is not what the catalogue says!).
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