Want to purchase electric range unassembled
I Googled for a few minutes and can't find anything you might be interested in, unless it is something like this (an unassembled "stove"):



Of course for any given range, taking off the oven door is something housewives are expected to do for deep Spring cleaning.  That removes a couple inches off the depth which should make the side profile about 24 inches.   Here is a side view of our GE Profile range:



Those handles stick out 2.1 inches.  The oven drawer and door slide out and can be removed without any tools.  The knobs stick out 1.0 inches but they easily slide off leaving shafts which don't protrude any more than the ridge below it.  This is a gas oven and range, but the female connector on the back doesn't extend beyond the chassis, so without a gas appliance line, the fore to aft distance without handles is 24.25 inches and 26.35 inches with the handles.  So this as large as can be standard size appliance (30 inch) would easily fit through your door&mdash;sideways.