We have a model: WW90K5413UX - 5 years old. 4 months ago the heater stopped working so I replaced it. It stopped working again recently. Replaced it again today. 5 minutes later it's blown again.

The heater wasn't officially for this model but it's 230V and 2000W. Are there any other differences in those elements? What else could be causing the heater element to be fried within 5 minutes?

It does seem weird because I have the same model, and it's been working fine for me.Sometimes, using a heater that's not officially meant for the model can cause issues, but if it's the right voltage and wattage, it should ideally work. Maybe there are some differences in the elements we're not aware of.A friend of mine recently had a similar problem with a different model, and they hired a washing machine repair service. They replaced some parts and got it working smoothly again. It might be worth looking into that option to identify and fix the underlying issue with your heating element.