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| ... My biggest problem is that the oven seems to sometimes heat quickly, sometimes heat slowly and sometimes the temperature drops in this function (ie I preheat the oven using a different function to 250° and after half an hour it falls to 180°). The technician suggested that the element is very weak and unable to heat the space on its own; surely as a minimum it should be able to maintain the temperature in the oven though?
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ok, thinkin this direction:
- appliances are designed for a planned, common use
- any over engineering means higher price (comparing to competition)
- heating is needed for thermal looses + heating needed to warm up air inside and the material of oven itself + heating up the food
The oven is heated fast (small space, little material), heating up the food inside is slow (as it is working over the hot air, which is not the best media) and because of that, it doesn't need much energy, so yes most energy is needed for thermal looses
You already have over-dimensioned heating element, the upper one, because of grill function.
Except for pizza baking I don't see any other scenario where you would need all the heat at the bottom. And even there, you are actually just compensating the fact that kitchen oven is not pizza oven!
So, to me it is logical that bottom element is weaker.
*for pizza baking you can use pizza stone or metal, and heat the whole oven
**or buy a nice small pizza oven
it is still unclear what you are trying to do, except if you are doing a test, how much the lower element heats.