Why does my oven take so long to heat up?
There is a large collection or reasons, some are:


Differences in makes and models
Modern form over function problems
Crap EU standards (EN 60350 etc) that limit the amount of power a element can use. It's something like &lt;= 0.25 W per cm2, and a typical domestic over is around 1100 cm2
For same standards the typical total KW/h of modern over is 3.5 KW/h, where ovens of twenty years ago where around 4.5 KW/h\