It is 9 degrees and front room space heater has quit. Thinking of taking kitchen space heater to front room and turning new elec oven on to protect plumbing. BRRR
Taking this as a question about how to stay warm without having the resource cost of replacing the space heater.
An electric oven is simply an electrical resistance heater in an insulated box. Sometimes with a fan. So probably not that different to your space heater. Running costs should be very similar.
You'll need to have the oven door open. And you'll need to keep an eye on it, and probably have the oven temperature turned down to its minimum - after all, a space heater would normally stop heating when its thermostat reaches 22°C or so, whereas an electric oven stops heating when its thermostat reaches, say. 200°C.
The other thing is that you can move a space heater around with you, to only heat the place you really need heating. Whereas ovens tend to be a lot less mobile.
So it's not really a long-term viable solution. More of a stop-gap for a few hours.
The good news is that most components in your space heater are probably recyclable. It may need to be treated as electronic waste, if it has a circuit-board controller. And it may be possible to get it repaired rather than replaced, meaning much less material waste.